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Schedule III - Consolidated Real Estate and Accumulated Depreciation (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Real Estate and Accumulated Depreciation [Line Items]      
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2014    
Initial Cost      
Land $ 1,370,286,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand    
Building & Improvements 2,572,774,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements    
Costs Capitalized Subsequent to Acquisition 463,537,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts    
Total Cost      
Land 1,404,454,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand    
Building & Improvements 3,005,432,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements    
Total 4,409,886,000us-gaap_RealEstateGrossAtCarryingValue 4,026,531,000us-gaap_RealEstateGrossAtCarryingValue 3,909,912,000us-gaap_RealEstateGrossAtCarryingValue
Accumulated Depreciation 933,708,000us-gaap_RealEstateAccumulatedDepreciation 844,873,000us-gaap_RealEstateAccumulatedDepreciation 782,749,000us-gaap_RealEstateAccumulatedDepreciation
Total Cost, Net of Accumulated Depreciation 3,476,178,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet    
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 541,605,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances    
Aggregate cost for Federal income tax purposes 4,600,000,000us-gaap_RealEstateFederalIncomeTaxBasis    
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 4,409,886,000us-gaap_RealEstateGrossAtCarryingValue 4,026,531,000us-gaap_RealEstateGrossAtCarryingValue 3,909,912,000us-gaap_RealEstateGrossAtCarryingValue
Acquired properties 274,091,000us-gaap_RealEstateOtherAcquisitions 143,992,000us-gaap_RealEstateOtherAcquisitions 220,340,000us-gaap_RealEstateOtherAcquisitions
Developments and improvements 191,250,000us-gaap_RealEstateImprovements 180,374,000us-gaap_RealEstateImprovements 141,807,000us-gaap_RealEstateImprovements
Sale of properties (81,811,000)us-gaap_RealEstateCostOfRealEstateSold (200,393,000)us-gaap_RealEstateCostOfRealEstateSold (491,438,000)us-gaap_RealEstateCostOfRealEstateSold
SEC Schedule III, Real Estate, Write-down or Reserve, Amount 175,000us-gaap_SECScheduleIIIRealEstateWritedownOrReserveAmount 7,354,000us-gaap_SECScheduleIIIRealEstateWritedownOrReserveAmount 62,709,000us-gaap_SECScheduleIIIRealEstateWritedownOrReserveAmount
Ending balance 4,026,531,000us-gaap_RealEstateGrossAtCarryingValue 3,909,912,000us-gaap_RealEstateGrossAtCarryingValue 4,101,912,000us-gaap_RealEstateGrossAtCarryingValue
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Beginning balance 844,873,000us-gaap_RealEstateAccumulatedDepreciation 782,749,000us-gaap_RealEstateAccumulatedDepreciation 791,619,000us-gaap_RealEstateAccumulatedDepreciation
Depreciation expense 108,692,000us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense 99,883,000us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense 104,087,000us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense
Sale of properties (19,857,000)us-gaap_RealEstateAccumulatedDepreciationRealEstateSold (36,405,000)us-gaap_RealEstateAccumulatedDepreciationRealEstateSold (104,748,000)us-gaap_RealEstateAccumulatedDepreciationRealEstateSold
Provision for impairment 0us-gaap_RealEstateAccumulatedDepreciationOtherDeductions (1,354,000)us-gaap_RealEstateAccumulatedDepreciationOtherDeductions (8,209,000)us-gaap_RealEstateAccumulatedDepreciationOtherDeductions
Ending balance 933,708,000us-gaap_RealEstateAccumulatedDepreciation 844,873,000us-gaap_RealEstateAccumulatedDepreciation 782,749,000us-gaap_RealEstateAccumulatedDepreciation
4S Commons Town Center [Member]      
Initial Cost      
Land 30,760,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CommonsTownCenter4SMember
   
Building & Improvements 35,830,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CommonsTownCenter4SMember
   
Costs Capitalized Subsequent to Acquisition 560,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CommonsTownCenter4SMember
   
Total Cost      
Land 30,812,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CommonsTownCenter4SMember
   
Building & Improvements 36,338,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CommonsTownCenter4SMember
   
Total 67,150,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CommonsTownCenter4SMember
   
Accumulated Depreciation 16,340,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CommonsTownCenter4SMember
   
Total Cost, Net of Accumulated Depreciation 50,810,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CommonsTownCenter4SMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 62,500,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CommonsTownCenter4SMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 67,150,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CommonsTownCenter4SMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 16,340,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CommonsTownCenter4SMember
   
Airport Crossing [Member]      
Initial Cost      
Land 1,748,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AirportCrossingMember
   
Building & Improvements 1,690,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AirportCrossingMember
   
Costs Capitalized Subsequent to Acquisition 88,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AirportCrossingMember
   
Total Cost      
Land 1,744,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AirportCrossingMember
   
Building & Improvements 1,782,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AirportCrossingMember
   
Total 3,526,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AirportCrossingMember
   
Accumulated Depreciation 746,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AirportCrossingMember
   
Total Cost, Net of Accumulated Depreciation 2,780,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AirportCrossingMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AirportCrossingMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 3,526,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AirportCrossingMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 746,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AirportCrossingMember
   
Amerige Heights Town Center [Member]      
Initial Cost      
Land 10,109,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AmerigeHeightsTownCenterMember
   
Building & Improvements 11,288,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AmerigeHeightsTownCenterMember
   
Costs Capitalized Subsequent to Acquisition 358,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AmerigeHeightsTownCenterMember
   
Total Cost      
Land 10,109,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AmerigeHeightsTownCenterMember
   
Building & Improvements 11,647,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AmerigeHeightsTownCenterMember
   
Total 21,756,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AmerigeHeightsTownCenterMember
   
Accumulated Depreciation 2,840,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AmerigeHeightsTownCenterMember
   
Total Cost, Net of Accumulated Depreciation 18,916,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AmerigeHeightsTownCenterMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 16,580,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AmerigeHeightsTownCenterMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 21,756,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AmerigeHeightsTownCenterMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 2,840,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AmerigeHeightsTownCenterMember
   
Anastasia Plaza [Member]      
Initial Cost      
Land 9,065,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AnastasiaPlazaMember
   
Building & Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AnastasiaPlazaMember
   
Costs Capitalized Subsequent to Acquisition 412,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AnastasiaPlazaMember
   
Total Cost      
Land 3,338,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AnastasiaPlazaMember
   
Building & Improvements 6,139,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AnastasiaPlazaMember
   
Total 9,477,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AnastasiaPlazaMember
   
Accumulated Depreciation 1,326,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AnastasiaPlazaMember
   
Total Cost, Net of Accumulated Depreciation 8,151,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AnastasiaPlazaMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AnastasiaPlazaMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 9,477,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AnastasiaPlazaMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 1,326,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AnastasiaPlazaMember
   
Ashburn Farm Market Center [Member]      
Initial Cost      
Land 9,835,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AshburnFarmMarketCenterMember
   
Building & Improvements 4,812,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AshburnFarmMarketCenterMember
   
Costs Capitalized Subsequent to Acquisition 130,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AshburnFarmMarketCenterMember
   
Total Cost      
Land 9,835,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AshburnFarmMarketCenterMember
   
Building & Improvements 4,942,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AshburnFarmMarketCenterMember
   
Total 14,777,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AshburnFarmMarketCenterMember
   
Accumulated Depreciation 3,521,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AshburnFarmMarketCenterMember
   
Total Cost, Net of Accumulated Depreciation 11,256,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AshburnFarmMarketCenterMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AshburnFarmMarketCenterMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 14,777,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AshburnFarmMarketCenterMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 3,521,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AshburnFarmMarketCenterMember
   
Ashford Perimeter [Member]      
Initial Cost      
Land 2,584,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AshfordPlaceMember
   
Building & Improvements 9,865,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AshfordPlaceMember
   
Costs Capitalized Subsequent to Acquisition 631,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AshfordPlaceMember
   
Total Cost      
Land 2,584,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AshfordPlaceMember
   
Building & Improvements 10,496,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AshfordPlaceMember
   
Total 13,080,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AshfordPlaceMember
   
Accumulated Depreciation 6,020,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AshfordPlaceMember
   
Total Cost, Net of Accumulated Depreciation 7,060,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AshfordPlaceMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AshfordPlaceMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 13,080,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AshfordPlaceMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 6,020,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AshfordPlaceMember
   
Aventura Shopping Center [Member]      
Initial Cost      
Land 2,751,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AventuraShoppingCenterMember
   
Building & Improvements 10,459,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AventuraShoppingCenterMember
   
Costs Capitalized Subsequent to Acquisition 17,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AventuraShoppingCenterMember
   
Total Cost      
Land 2,751,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AventuraShoppingCenterMember
   
Building & Improvements 10,476,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AventuraShoppingCenterMember
   
Total 13,227,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AventuraShoppingCenterMember
   
Accumulated Depreciation 10,298,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AventuraShoppingCenterMember
   
Total Cost, Net of Accumulated Depreciation 2,929,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AventuraShoppingCenterMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AventuraShoppingCenterMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 13,227,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AventuraShoppingCenterMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 10,298,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AventuraShoppingCenterMember
   
Augusta Center [Member]      
Initial Cost      
Land 5,142,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AugustaCenterMember
   
Building & Improvements 2,720,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AugustaCenterMember
   
Costs Capitalized Subsequent to Acquisition (5,635,000)us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AugustaCenterMember
   
Total Cost      
Land 1,366,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AugustaCenterMember
   
Building & Improvements 861,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AugustaCenterMember
   
Total 2,227,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AugustaCenterMember
   
Accumulated Depreciation 334,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AugustaCenterMember
   
Total Cost, Net of Accumulated Depreciation 1,893,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AugustaCenterMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AugustaCenterMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 2,227,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AugustaCenterMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 334,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_AugustaCenterMember
   
Balboa Mesa Shopping Center [Member]      
Initial Cost      
Land 23,074,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BalboaMesaShoppingCenterMember
   
Building & Improvements 33,838,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BalboaMesaShoppingCenterMember
   
Costs Capitalized Subsequent to Acquisition 13,215,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BalboaMesaShoppingCenterMember
   
Total Cost      
Land 27,715,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BalboaMesaShoppingCenterMember
   
Building & Improvements 42,869,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BalboaMesaShoppingCenterMember
   
Total 70,584,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BalboaMesaShoppingCenterMember
   
Accumulated Depreciation 3,378,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BalboaMesaShoppingCenterMember
   
Total Cost, Net of Accumulated Depreciation 67,206,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BalboaMesaShoppingCenterMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BalboaMesaShoppingCenterMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 70,584,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BalboaMesaShoppingCenterMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 3,378,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BalboaMesaShoppingCenterMember
   
Belleview Square [Member]      
Initial Cost      
Land 8,132,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BelleviewSquareMember
   
Building & Improvements 9,756,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BelleviewSquareMember
   
Costs Capitalized Subsequent to Acquisition 2,324,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BelleviewSquareMember
   
Total Cost      
Land 8,323,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BelleviewSquareMember
   
Building & Improvements 11,889,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BelleviewSquareMember
   
Total 20,212,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BelleviewSquareMember
   
Accumulated Depreciation 5,506,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BelleviewSquareMember
   
Total Cost, Net of Accumulated Depreciation 14,706,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BelleviewSquareMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BelleviewSquareMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 20,212,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BelleviewSquareMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 5,506,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BelleviewSquareMember
   
Berkshire Commons [Member]      
Initial Cost      
Land 2,295,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BerkshireCommonsMember
   
Building & Improvements 9,551,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BerkshireCommonsMember
   
Costs Capitalized Subsequent to Acquisition 1,867,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BerkshireCommonsMember
   
Total Cost      
Land 2,965,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BerkshireCommonsMember
   
Building & Improvements 10,749,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BerkshireCommonsMember
   
Total 13,714,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BerkshireCommonsMember
   
Accumulated Depreciation 6,397,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BerkshireCommonsMember
   
Total Cost, Net of Accumulated Depreciation 7,317,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BerkshireCommonsMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 7,500,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BerkshireCommonsMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 13,714,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BerkshireCommonsMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 6,397,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BerkshireCommonsMember
   
Blackrock [Member] [Domain]      
Initial Cost      
Land 22,251,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BlackrockMemberDomain
   
Building & Improvements 20,815,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BlackrockMemberDomain
   
Costs Capitalized Subsequent to Acquisition (103,000)us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BlackrockMemberDomain
   
Total Cost      
Land 22,251,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BlackrockMemberDomain
   
Building & Improvements 20,711,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BlackrockMemberDomain
   
Total 42,962,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BlackrockMemberDomain
   
Accumulated Depreciation 882,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BlackrockMemberDomain
   
Total Cost, Net of Accumulated Depreciation 42,080,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BlackrockMemberDomain
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 20,124,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BlackrockMemberDomain
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 42,962,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BlackrockMemberDomain
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 882,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BlackrockMemberDomain
   
Bloomingdale Square [Member]      
Initial Cost      
Land 3,940,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BloomingdaleSquareMember
   
Building & Improvements 14,912,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BloomingdaleSquareMember
   
Costs Capitalized Subsequent to Acquisition 2,053,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BloomingdaleSquareMember
   
Total Cost      
Land 3,940,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BloomingdaleSquareMember
   
Building & Improvements 16,965,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BloomingdaleSquareMember
   
Total 20,905,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BloomingdaleSquareMember
   
Accumulated Depreciation 7,377,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BloomingdaleSquareMember
   
Total Cost, Net of Accumulated Depreciation 13,528,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BloomingdaleSquareMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BloomingdaleSquareMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 20,905,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BloomingdaleSquareMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 7,377,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BloomingdaleSquareMember
   
Boulevard Center [Member]      
Initial Cost      
Land 3,659,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BoulevardCenterMember
   
Building & Improvements 10,787,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BoulevardCenterMember
   
Costs Capitalized Subsequent to Acquisition 1,125,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BoulevardCenterMember
   
Total Cost      
Land 3,659,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BoulevardCenterMember
   
Building & Improvements 11,912,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BoulevardCenterMember
   
Total 15,571,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BoulevardCenterMember
   
Accumulated Depreciation 5,475,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BoulevardCenterMember
   
Total Cost, Net of Accumulated Depreciation 10,096,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BoulevardCenterMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BoulevardCenterMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 15,571,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BoulevardCenterMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 5,475,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BoulevardCenterMember
   
Boynton Lakes Plaza [Member]      
Initial Cost      
Land 2,628,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BoyntonLakesPlazaMember
   
Building & Improvements 11,236,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BoyntonLakesPlazaMember
   
Costs Capitalized Subsequent to Acquisition 4,452,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BoyntonLakesPlazaMember
   
Total Cost      
Land 3,606,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BoyntonLakesPlazaMember
   
Building & Improvements 14,710,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BoyntonLakesPlazaMember
   
Total 18,316,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BoyntonLakesPlazaMember
   
Accumulated Depreciation 5,144,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BoyntonLakesPlazaMember
   
Total Cost, Net of Accumulated Depreciation 13,172,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BoyntonLakesPlazaMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BoyntonLakesPlazaMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 18,316,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BoyntonLakesPlazaMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 5,144,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BoyntonLakesPlazaMember
   
Brentwood Plaza [Member]      
Initial Cost      
Land 2,788,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BrentwoodPlazaMember
   
Building & Improvements 3,473,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BrentwoodPlazaMember
   
Costs Capitalized Subsequent to Acquisition 238,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BrentwoodPlazaMember
   
Total Cost      
Land 2,788,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BrentwoodPlazaMember
   
Building & Improvements 3,711,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BrentwoodPlazaMember
   
Total 6,499,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BrentwoodPlazaMember
   
Accumulated Depreciation 637,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BrentwoodPlazaMember
   
Total Cost, Net of Accumulated Depreciation 5,862,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BrentwoodPlazaMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BrentwoodPlazaMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 6,499,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BrentwoodPlazaMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 637,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BrentwoodPlazaMember
   
Briarcliff La Vista [Member]      
Initial Cost      
Land 694,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BriarcliffLaVistaMember
   
Building & Improvements 3,292,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BriarcliffLaVistaMember
   
Costs Capitalized Subsequent to Acquisition 297,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BriarcliffLaVistaMember
   
Total Cost      
Land 694,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BriarcliffLaVistaMember
   
Building & Improvements 3,589,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BriarcliffLaVistaMember
   
Total 4,283,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BriarcliffLaVistaMember
   
Accumulated Depreciation 2,305,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BriarcliffLaVistaMember
   
Total Cost, Net of Accumulated Depreciation 1,978,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BriarcliffLaVistaMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BriarcliffLaVistaMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 4,283,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BriarcliffLaVistaMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 2,305,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BriarcliffLaVistaMember
   
Briarcliff Village [Member]      
Initial Cost      
Land 4,597,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BriarcliffVillageMember
   
Building & Improvements 24,836,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BriarcliffVillageMember
   
Costs Capitalized Subsequent to Acquisition 1,190,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BriarcliffVillageMember
   
Total Cost      
Land 4,597,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BriarcliffVillageMember
   
Building & Improvements 26,026,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BriarcliffVillageMember
   
Total 30,623,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BriarcliffVillageMember
   
Accumulated Depreciation 14,935,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BriarcliffVillageMember
   
Total Cost, Net of Accumulated Depreciation 15,688,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BriarcliffVillageMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BriarcliffVillageMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 30,623,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BriarcliffVillageMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 14,935,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BriarcliffVillageMember
   
Brickwalk [Member]      
Initial Cost      
Land 25,299,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BrickwalkMember
   
Building & Improvements 41,995,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BrickwalkMember
   
Costs Capitalized Subsequent to Acquisition 237,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BrickwalkMember
   
Total Cost      
Land 25,299,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BrickwalkMember
   
Building & Improvements 42,232,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BrickwalkMember
   
Total 67,531,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BrickwalkMember
   
Accumulated Depreciation 1,240,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BrickwalkMember
   
Total Cost, Net of Accumulated Depreciation 66,291,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BrickwalkMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 31,823,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BrickwalkMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 67,531,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BrickwalkMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 1,240,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BrickwalkMember
   
Bridgeton [Member]      
Initial Cost      
Land 3,033,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BridgetonMember
   
Building & Improvements 8,137,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BridgetonMember
   
Costs Capitalized Subsequent to Acquisition 107,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BridgetonMember
   
Total Cost      
Land 3,067,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BridgetonMember
   
Building & Improvements 8,210,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BridgetonMember
   
Total 11,277,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BridgetonMember
   
Accumulated Depreciation 1,196,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BridgetonMember
   
Total Cost, Net of Accumulated Depreciation 10,081,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BridgetonMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BridgetonMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 11,277,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BridgetonMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 1,196,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BridgetonMember
   
Brighten Park [Member]      
Initial Cost      
Land 3,983,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BrightenParkMember
   
Building & Improvements 18,687,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BrightenParkMember
   
Costs Capitalized Subsequent to Acquisition 1,275,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BrightenParkMember
   
Total Cost      
Land 3,926,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BrightenParkMember
   
Building & Improvements 20,019,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BrightenParkMember
   
Total 23,945,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BrightenParkMember
   
Accumulated Depreciation 10,368,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BrightenParkMember
   
Total Cost, Net of Accumulated Depreciation 13,577,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BrightenParkMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BrightenParkMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 23,945,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BrightenParkMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 10,368,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BrightenParkMember
   
Buckhead Court [Member]      
Initial Cost      
Land 1,417,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BuckheadCourtMember
   
Building & Improvements 7,432,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BuckheadCourtMember
   
Costs Capitalized Subsequent to Acquisition 500,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BuckheadCourtMember
   
Total Cost      
Land 1,417,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BuckheadCourtMember
   
Building & Improvements 7,932,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BuckheadCourtMember
   
Total 9,349,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BuckheadCourtMember
   
Accumulated Depreciation 4,960,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BuckheadCourtMember
   
Total Cost, Net of Accumulated Depreciation 4,389,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BuckheadCourtMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BuckheadCourtMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 9,349,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BuckheadCourtMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 4,960,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BuckheadCourtMember
   
Buckley Square [Member]      
Initial Cost      
Land 2,970,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BuckleySquareMember
   
Building & Improvements 5,978,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BuckleySquareMember
   
Costs Capitalized Subsequent to Acquisition 749,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BuckleySquareMember
   
Total Cost      
Land 2,970,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BuckleySquareMember
   
Building & Improvements 6,727,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BuckleySquareMember
   
Total 9,697,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BuckleySquareMember
   
Accumulated Depreciation 3,295,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BuckleySquareMember
   
Total Cost, Net of Accumulated Depreciation 6,402,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BuckleySquareMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BuckleySquareMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 9,697,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BuckleySquareMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 3,295,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BuckleySquareMember
   
Buckwalter Place Shopping Ctr [Member]      
Initial Cost      
Land 6,563,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BuckwalterPlaceShoppingCtrMember
   
Building & Improvements 6,590,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BuckwalterPlaceShoppingCtrMember
   
Costs Capitalized Subsequent to Acquisition 264,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BuckwalterPlaceShoppingCtrMember
   
Total Cost      
Land 6,592,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BuckwalterPlaceShoppingCtrMember
   
Building & Improvements 6,825,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BuckwalterPlaceShoppingCtrMember
   
Total 13,417,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BuckwalterPlaceShoppingCtrMember
   
Accumulated Depreciation 2,620,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BuckwalterPlaceShoppingCtrMember
   
Total Cost, Net of Accumulated Depreciation 10,797,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BuckwalterPlaceShoppingCtrMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BuckwalterPlaceShoppingCtrMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 13,417,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BuckwalterPlaceShoppingCtrMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 2,620,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_BuckwalterPlaceShoppingCtrMember
   
Caligo Crossing [Member]      
Initial Cost      
Land 2,459,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CaligoCrossingMember
   
Building & Improvements 4,897,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CaligoCrossingMember
   
Costs Capitalized Subsequent to Acquisition 124,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CaligoCrossingMember
   
Total Cost      
Land 2,546,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CaligoCrossingMember
   
Building & Improvements 4,934,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CaligoCrossingMember
   
Total 7,480,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CaligoCrossingMember
   
Accumulated Depreciation 1,775,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CaligoCrossingMember
   
Total Cost, Net of Accumulated Depreciation 5,705,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CaligoCrossingMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CaligoCrossingMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 7,480,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CaligoCrossingMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 1,775,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CaligoCrossingMember
   
Cambridge Square [Member]      
Initial Cost      
Land 774,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CambridgeSquareMember
   
Building & Improvements 4,347,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CambridgeSquareMember
   
Costs Capitalized Subsequent to Acquisition 687,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CambridgeSquareMember
   
Total Cost      
Land 774,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CambridgeSquareMember
   
Building & Improvements 5,034,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CambridgeSquareMember
   
Total 5,808,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CambridgeSquareMember
   
Accumulated Depreciation 2,578,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CambridgeSquareMember
   
Total Cost, Net of Accumulated Depreciation 3,230,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CambridgeSquareMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CambridgeSquareMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 5,808,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CambridgeSquareMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 2,578,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CambridgeSquareMember
   
Carmel commons [Member]      
Initial Cost      
Land 2,466,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CarmelCommonsMember
   
Building & Improvements 12,548,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CarmelCommonsMember
   
Costs Capitalized Subsequent to Acquisition 4,412,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CarmelCommonsMember
   
Total Cost      
Land 3,422,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CarmelCommonsMember
   
Building & Improvements 16,004,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CarmelCommonsMember
   
Total 19,426,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CarmelCommonsMember
   
Accumulated Depreciation 6,896,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CarmelCommonsMember
   
Total Cost, Net of Accumulated Depreciation 12,530,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CarmelCommonsMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CarmelCommonsMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 19,426,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CarmelCommonsMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 6,896,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CarmelCommonsMember
   
Carriage Gate [Member]      
Initial Cost      
Land 833,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CarriageGateMember
   
Building & Improvements 4,974,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CarriageGateMember
   
Costs Capitalized Subsequent to Acquisition 2,424,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CarriageGateMember
   
Total Cost      
Land 1,302,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CarriageGateMember
   
Building & Improvements 6,928,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CarriageGateMember
   
Total 8,230,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CarriageGateMember
   
Accumulated Depreciation 4,297,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CarriageGateMember
   
Total Cost, Net of Accumulated Depreciation 3,933,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CarriageGateMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CarriageGateMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 8,230,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CarriageGateMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 4,297,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CarriageGateMember
   
Centerplace of Greeley III [Member]      
Initial Cost      
Land 6,661,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CenterplaceOfGreeleyIiiMember
   
Building & Improvements 11,502,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CenterplaceOfGreeleyIiiMember
   
Costs Capitalized Subsequent to Acquisition 1,423,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CenterplaceOfGreeleyIiiMember
   
Total Cost      
Land 5,690,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CenterplaceOfGreeleyIiiMember
   
Building & Improvements 13,896,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CenterplaceOfGreeleyIiiMember
   
Total 19,586,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CenterplaceOfGreeleyIiiMember
   
Accumulated Depreciation 3,550,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CenterplaceOfGreeleyIiiMember
   
Total Cost, Net of Accumulated Depreciation 16,036,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CenterplaceOfGreeleyIiiMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CenterplaceOfGreeleyIiiMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 19,586,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CenterplaceOfGreeleyIiiMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 3,550,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CenterplaceOfGreeleyIiiMember
   
Chasewood Plaza [Member]      
Initial Cost      
Land 4,612,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ChasewoodPlazaMember
   
Building & Improvements 20,829,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ChasewoodPlazaMember
   
Costs Capitalized Subsequent to Acquisition (400,000)us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ChasewoodPlazaMember
   
Total Cost      
Land 4,688,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ChasewoodPlazaMember
   
Building & Improvements 20,353,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ChasewoodPlazaMember
   
Total 25,041,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ChasewoodPlazaMember
   
Accumulated Depreciation 12,296,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ChasewoodPlazaMember
   
Total Cost, Net of Accumulated Depreciation 12,745,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ChasewoodPlazaMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ChasewoodPlazaMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 25,041,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ChasewoodPlazaMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 12,296,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ChasewoodPlazaMember
   
Cherry Grove [Member]      
Initial Cost      
Land 3,533,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CherryGroveMember
   
Building & Improvements 15,862,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CherryGroveMember
   
Costs Capitalized Subsequent to Acquisition 1,949,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CherryGroveMember
   
Total Cost      
Land 3,533,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CherryGroveMember
   
Building & Improvements 17,810,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CherryGroveMember
   
Total 21,343,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CherryGroveMember
   
Accumulated Depreciation 7,625,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CherryGroveMember
   
Total Cost, Net of Accumulated Depreciation 13,718,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CherryGroveMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CherryGroveMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 21,343,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CherryGroveMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 7,625,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CherryGroveMember
   
Clayton Valley Shopping Center [Member]      
Initial Cost      
Land 24,189,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ClaytonValleyShoppingCenterMember
   
Building & Improvements 35,422,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ClaytonValleyShoppingCenterMember
   
Costs Capitalized Subsequent to Acquisition 2,187,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ClaytonValleyShoppingCenterMember
   
Total Cost      
Land 24,538,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ClaytonValleyShoppingCenterMember
   
Building & Improvements 37,260,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ClaytonValleyShoppingCenterMember
   
Total 61,798,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ClaytonValleyShoppingCenterMember
   
Accumulated Depreciation 16,662,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ClaytonValleyShoppingCenterMember
   
Total Cost, Net of Accumulated Depreciation 45,136,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ClaytonValleyShoppingCenterMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ClaytonValleyShoppingCenterMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 61,798,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ClaytonValleyShoppingCenterMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 16,662,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ClaytonValleyShoppingCenterMember
   
Clybourn Commons [Member]      
Initial Cost      
Land 15,056,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ClybournCommonsMember
   
Building & Improvements 5,594,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ClybournCommonsMember
   
Costs Capitalized Subsequent to Acquisition 40,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ClybournCommonsMember
   
Total Cost      
Land 15,056,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ClybournCommonsMember
   
Building & Improvements 5,634,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ClybournCommonsMember
   
Total 20,690,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ClybournCommonsMember
   
Accumulated Depreciation 161,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ClybournCommonsMember
   
Total Cost, Net of Accumulated Depreciation 20,529,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ClybournCommonsMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ClybournCommonsMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 20,690,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ClybournCommonsMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 161,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ClybournCommonsMember
   
Cochran's Crossing [Member]      
Initial Cost      
Land 13,154,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CochransCrossingMember
   
Building & Improvements 12,315,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CochransCrossingMember
   
Costs Capitalized Subsequent to Acquisition 739,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CochransCrossingMember
   
Total Cost      
Land 13,154,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CochransCrossingMember
   
Building & Improvements 13,054,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CochransCrossingMember
   
Total 26,208,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CochransCrossingMember
   
Accumulated Depreciation 7,540,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CochransCrossingMember
   
Total Cost, Net of Accumulated Depreciation 18,668,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CochransCrossingMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CochransCrossingMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 26,208,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CochransCrossingMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 7,540,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CochransCrossingMember
   
Corkscrew Village [Member]      
Initial Cost      
Land 8,407,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CorkscrewVillageMember
   
Building & Improvements 8,004,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CorkscrewVillageMember
   
Costs Capitalized Subsequent to Acquisition 118,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CorkscrewVillageMember
   
Total Cost      
Land 8,407,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CorkscrewVillageMember
   
Building & Improvements 8,122,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CorkscrewVillageMember
   
Total 16,529,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CorkscrewVillageMember
   
Accumulated Depreciation 2,401,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CorkscrewVillageMember
   
Total Cost, Net of Accumulated Depreciation 14,128,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CorkscrewVillageMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 7,923,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CorkscrewVillageMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 16,529,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CorkscrewVillageMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 2,401,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CorkscrewVillageMember
   
Cornerstone Square [Member]      
Initial Cost      
Land 1,772,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CornerstoneSquareMember
   
Building & Improvements 6,944,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CornerstoneSquareMember
   
Costs Capitalized Subsequent to Acquisition 1,054,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CornerstoneSquareMember
   
Total Cost      
Land 1,772,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CornerstoneSquareMember
   
Building & Improvements 7,998,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CornerstoneSquareMember
   
Total 9,770,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CornerstoneSquareMember
   
Accumulated Depreciation 4,250,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CornerstoneSquareMember
   
Total Cost, Net of Accumulated Depreciation 5,520,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CornerstoneSquareMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CornerstoneSquareMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 9,770,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CornerstoneSquareMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 4,250,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CornerstoneSquareMember
   
Corvallis Market Center [Member]      
Initial Cost      
Land 6,674,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CorvallisMarketCenterMember
   
Building & Improvements 12,244,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CorvallisMarketCenterMember
   
Costs Capitalized Subsequent to Acquisition 357,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CorvallisMarketCenterMember
   
Total Cost      
Land 6,696,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CorvallisMarketCenterMember
   
Building & Improvements 12,580,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CorvallisMarketCenterMember
   
Total 19,276,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CorvallisMarketCenterMember
   
Accumulated Depreciation 3,566,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CorvallisMarketCenterMember
   
Total Cost, Net of Accumulated Depreciation 15,710,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CorvallisMarketCenterMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CorvallisMarketCenterMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 19,276,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CorvallisMarketCenterMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 3,566,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CorvallisMarketCenterMember
   
Costa Verde Center [Member]      
Initial Cost      
Land 12,740,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CostaVerdeCenterMember
   
Building & Improvements 26,868,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CostaVerdeCenterMember
   
Costs Capitalized Subsequent to Acquisition 1,236,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CostaVerdeCenterMember
   
Total Cost      
Land 12,798,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CostaVerdeCenterMember
   
Building & Improvements 28,046,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CostaVerdeCenterMember
   
Total 40,844,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CostaVerdeCenterMember
   
Accumulated Depreciation 13,044,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CostaVerdeCenterMember
   
Total Cost, Net of Accumulated Depreciation 27,800,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CostaVerdeCenterMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CostaVerdeCenterMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 40,844,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CostaVerdeCenterMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 13,044,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CostaVerdeCenterMember
   
Courtyard Landcom [Member]      
Initial Cost      
Land 5,867,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CourtyardShoppingCenterMember
   
Building & Improvements 4,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CourtyardShoppingCenterMember
   
Costs Capitalized Subsequent to Acquisition 3,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CourtyardShoppingCenterMember
   
Total Cost      
Land 5,867,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CourtyardShoppingCenterMember
   
Building & Improvements 7,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CourtyardShoppingCenterMember
   
Total 5,874,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CourtyardShoppingCenterMember
   
Accumulated Depreciation 1,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CourtyardShoppingCenterMember
   
Total Cost, Net of Accumulated Depreciation 5,873,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CourtyardShoppingCenterMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CourtyardShoppingCenterMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 5,874,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CourtyardShoppingCenterMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 1,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CourtyardShoppingCenterMember
   
Culpeper Colonnade [Member]      
Initial Cost      
Land 15,944,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CulpeperColonnadeMember
   
Building & Improvements 10,601,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CulpeperColonnadeMember
   
Costs Capitalized Subsequent to Acquisition 4,772,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CulpeperColonnadeMember
   
Total Cost      
Land 16,258,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CulpeperColonnadeMember
   
Building & Improvements 15,184,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CulpeperColonnadeMember
   
Total 31,442,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CulpeperColonnadeMember
   
Accumulated Depreciation 5,853,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CulpeperColonnadeMember
   
Total Cost, Net of Accumulated Depreciation 25,589,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CulpeperColonnadeMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CulpeperColonnadeMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 31,442,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CulpeperColonnadeMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 5,853,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CulpeperColonnadeMember
   
Dardenne Crossing [Member]      
Initial Cost      
Land 4,194,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DardenneCrossingMember
   
Building & Improvements 4,005,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DardenneCrossingMember
   
Costs Capitalized Subsequent to Acquisition 482,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DardenneCrossingMember
   
Total Cost      
Land 4,583,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DardenneCrossingMember
   
Building & Improvements 4,098,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DardenneCrossingMember
   
Total 8,681,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DardenneCrossingMember
   
Accumulated Depreciation 840,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DardenneCrossingMember
   
Total Cost, Net of Accumulated Depreciation 7,841,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DardenneCrossingMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DardenneCrossingMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 8,681,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DardenneCrossingMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 840,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DardenneCrossingMember
   
Delk Spectrum [Member]      
Initial Cost      
Land 2,985,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DelkSpectrumMember
   
Building & Improvements 12,001,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DelkSpectrumMember
   
Costs Capitalized Subsequent to Acquisition 1,327,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DelkSpectrumMember
   
Total Cost      
Land 3,000,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DelkSpectrumMember
   
Building & Improvements 13,313,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DelkSpectrumMember
   
Total 16,313,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DelkSpectrumMember
   
Accumulated Depreciation 5,867,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DelkSpectrumMember
   
Total Cost, Net of Accumulated Depreciation 10,446,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DelkSpectrumMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DelkSpectrumMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 16,313,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DelkSpectrumMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 5,867,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DelkSpectrumMember
   
Diablo Plaza [Member]      
Initial Cost      
Land 5,300,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DiabloPlazaMember
   
Building & Improvements 8,181,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DiabloPlazaMember
   
Costs Capitalized Subsequent to Acquisition 1,079,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DiabloPlazaMember
   
Total Cost      
Land 5,300,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DiabloPlazaMember
   
Building & Improvements 9,260,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DiabloPlazaMember
   
Total 14,560,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DiabloPlazaMember
   
Accumulated Depreciation 3,922,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DiabloPlazaMember
   
Total Cost, Net of Accumulated Depreciation 10,638,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DiabloPlazaMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DiabloPlazaMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 14,560,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DiabloPlazaMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 3,922,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DiabloPlazaMember
   
Dunwoody Village [Member]      
Initial Cost      
Land 3,342,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DunwoodyVillageMember
   
Building & Improvements 15,934,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DunwoodyVillageMember
   
Costs Capitalized Subsequent to Acquisition 3,232,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DunwoodyVillageMember
   
Total Cost      
Land 3,342,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DunwoodyVillageMember
   
Building & Improvements 19,166,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DunwoodyVillageMember
   
Total 22,508,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DunwoodyVillageMember
   
Accumulated Depreciation 10,600,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DunwoodyVillageMember
   
Total Cost, Net of Accumulated Depreciation 11,908,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DunwoodyVillageMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DunwoodyVillageMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 22,508,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DunwoodyVillageMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 10,600,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_DunwoodyVillageMember
   
East Pointe [Member]      
Initial Cost      
Land 1,730,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_EastPointeMember
   
Building & Improvements 7,189,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_EastPointeMember
   
Costs Capitalized Subsequent to Acquisition 1,726,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_EastPointeMember
   
Total Cost      
Land 1,771,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_EastPointeMember
   
Building & Improvements 8,874,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_EastPointeMember
   
Total 10,645,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_EastPointeMember
   
Accumulated Depreciation 3,917,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_EastPointeMember
   
Total Cost, Net of Accumulated Depreciation 6,728,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_EastPointeMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_EastPointeMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 10,645,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_EastPointeMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 3,917,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_EastPointeMember
   
East Washington Place [Member]      
Initial Cost      
Land 15,993,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_EastWashingtonPlaceMember
   
Building & Improvements 40,151,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_EastWashingtonPlaceMember
   
Costs Capitalized Subsequent to Acquisition 677,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_EastWashingtonPlaceMember
   
Total Cost      
Land 15,509,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_EastWashingtonPlaceMember
   
Building & Improvements 41,311,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_EastWashingtonPlaceMember
   
Total 56,820,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_EastWashingtonPlaceMember
   
Accumulated Depreciation 2,987,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_EastWashingtonPlaceMember
   
Total Cost, Net of Accumulated Depreciation 53,833,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_EastWashingtonPlaceMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_EastWashingtonPlaceMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 56,820,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_EastWashingtonPlaceMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 2,987,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_EastWashingtonPlaceMember
   
El Camino Shopping Center [Member]      
Initial Cost      
Land 7,600,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ElCaminoShoppingCenterMember
   
Building & Improvements 11,538,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ElCaminoShoppingCenterMember
   
Costs Capitalized Subsequent to Acquisition 1,258,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ElCaminoShoppingCenterMember
   
Total Cost      
Land 7,600,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ElCaminoShoppingCenterMember
   
Building & Improvements 12,796,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ElCaminoShoppingCenterMember
   
Total 20,396,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ElCaminoShoppingCenterMember
   
Accumulated Depreciation 4,983,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ElCaminoShoppingCenterMember
   
Total Cost, Net of Accumulated Depreciation 15,413,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ElCaminoShoppingCenterMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ElCaminoShoppingCenterMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 20,396,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ElCaminoShoppingCenterMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 4,983,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ElCaminoShoppingCenterMember
   
El Cerrito Plaza [Member]      
Initial Cost      
Land 11,025,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ElCerritoPlazaMember
   
Building & Improvements 27,371,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ElCerritoPlazaMember
   
Costs Capitalized Subsequent to Acquisition 679,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ElCerritoPlazaMember
   
Total Cost      
Land 11,025,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ElCerritoPlazaMember
   
Building & Improvements 28,050,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ElCerritoPlazaMember
   
Total 39,075,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ElCerritoPlazaMember
   
Accumulated Depreciation 6,192,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ElCerritoPlazaMember
   
Total Cost, Net of Accumulated Depreciation 32,883,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ElCerritoPlazaMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 38,694,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ElCerritoPlazaMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 39,075,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ElCerritoPlazaMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 6,192,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ElCerritoPlazaMember
   
El Norte Parkway Plaza [Member]      
Initial Cost      
Land 2,834,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ElNortePkwyPlazaMember
   
Building & Improvements 7,370,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ElNortePkwyPlazaMember
   
Costs Capitalized Subsequent to Acquisition 3,243,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ElNortePkwyPlazaMember
   
Total Cost      
Land 3,263,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ElNortePkwyPlazaMember
   
Building & Improvements 10,185,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ElNortePkwyPlazaMember
   
Total 13,448,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ElNortePkwyPlazaMember
   
Accumulated Depreciation 3,693,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ElNortePkwyPlazaMember
   
Total Cost, Net of Accumulated Depreciation 9,755,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ElNortePkwyPlazaMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ElNortePkwyPlazaMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 13,448,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ElNortePkwyPlazaMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 3,693,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ElNortePkwyPlazaMember
   
Encina Grande [Member]      
Initial Cost      
Land 5,040,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_EncinaGrandeMember
   
Building & Improvements 11,572,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_EncinaGrandeMember
   
Costs Capitalized Subsequent to Acquisition (25,000)us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_EncinaGrandeMember
   
Total Cost      
Land 5,040,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_EncinaGrandeMember
   
Building & Improvements 11,547,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_EncinaGrandeMember
   
Total 16,587,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_EncinaGrandeMember
   
Accumulated Depreciation 6,343,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_EncinaGrandeMember
   
Total Cost, Net of Accumulated Depreciation 10,244,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_EncinaGrandeMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_EncinaGrandeMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 16,587,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_EncinaGrandeMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 6,343,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_EncinaGrandeMember
   
Fairfax Shopping Center [Member]      
Initial Cost      
Land 15,239,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FairfaxShoppingCenterMember
   
Building & Improvements 11,367,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FairfaxShoppingCenterMember
   
Costs Capitalized Subsequent to Acquisition (5,548,000)us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FairfaxShoppingCenterMember
   
Total Cost      
Land 13,175,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FairfaxShoppingCenterMember
   
Building & Improvements 7,882,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FairfaxShoppingCenterMember
   
Total 21,057,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FairfaxShoppingCenterMember
   
Accumulated Depreciation 1,766,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FairfaxShoppingCenterMember
   
Total Cost, Net of Accumulated Depreciation 19,291,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FairfaxShoppingCenterMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FairfaxShoppingCenterMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 21,057,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FairfaxShoppingCenterMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 1,766,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FairfaxShoppingCenterMember
   
Fairfield [Member]      
Initial Cost      
Land 6,731,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FairfieldMember
   
Building & Improvements 29,420,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FairfieldMember
   
Costs Capitalized Subsequent to Acquisition 128,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FairfieldMember
   
Total Cost      
Land 6,731,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FairfieldMember
   
Building & Improvements 29,548,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FairfieldMember
   
Total 36,279,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FairfieldMember
   
Accumulated Depreciation 809,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FairfieldMember
   
Total Cost, Net of Accumulated Depreciation 35,470,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FairfieldMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 20,250,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FairfieldMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 36,279,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FairfieldMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 809,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FairfieldMember
   
Falcon [Member]      
Initial Cost      
Land 1,340,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FalconMember
   
Building & Improvements 4,168,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FalconMember
   
Costs Capitalized Subsequent to Acquisition 157,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FalconMember
   
Total Cost      
Land 1,350,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FalconMember
   
Building & Improvements 4,315,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FalconMember
   
Total 5,665,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FalconMember
   
Accumulated Depreciation 1,401,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FalconMember
   
Total Cost, Net of Accumulated Depreciation 4,264,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FalconMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FalconMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 5,665,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FalconMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 1,401,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FalconMember
   
Fellsway Plaza [Member]      
Initial Cost      
Land 30,712,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FellswayPlazaMember
   
Building & Improvements 7,327,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FellswayPlazaMember
   
Costs Capitalized Subsequent to Acquisition 2,347,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FellswayPlazaMember
   
Total Cost      
Land 32,736,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FellswayPlazaMember
   
Building & Improvements 7,650,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FellswayPlazaMember
   
Total 40,386,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FellswayPlazaMember
   
Accumulated Depreciation 861,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FellswayPlazaMember
   
Total Cost, Net of Accumulated Depreciation 39,525,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FellswayPlazaMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 29,839,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FellswayPlazaMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 40,386,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FellswayPlazaMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 861,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FellswayPlazaMember
   
Fenton Marketplace [Member]      
Initial Cost      
Land 2,298,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FentonMarketplaceMember
   
Building & Improvements 8,510,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FentonMarketplaceMember
   
Costs Capitalized Subsequent to Acquisition (8,326,000)us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FentonMarketplaceMember
   
Total Cost      
Land 512,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FentonMarketplaceMember
   
Building & Improvements 1,971,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FentonMarketplaceMember
   
Total 2,483,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FentonMarketplaceMember
   
Accumulated Depreciation 281,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FentonMarketplaceMember
   
Total Cost, Net of Accumulated Depreciation 2,202,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FentonMarketplaceMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FentonMarketplaceMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 2,483,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FentonMarketplaceMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 281,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FentonMarketplaceMember
   
Fleming Island [Member]      
Initial Cost      
Land 3,077,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FlemingIslandMember
   
Building & Improvements 11,587,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FlemingIslandMember
   
Costs Capitalized Subsequent to Acquisition 2,686,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FlemingIslandMember
   
Total Cost      
Land 3,111,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FlemingIslandMember
   
Building & Improvements 14,239,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FlemingIslandMember
   
Total 17,350,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FlemingIslandMember
   
Accumulated Depreciation 5,371,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FlemingIslandMember
   
Total Cost, Net of Accumulated Depreciation 11,979,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FlemingIslandMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FlemingIslandMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 17,350,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FlemingIslandMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 5,371,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FlemingIslandMember
   
French Valley Village Center [Member]      
Initial Cost      
Land 11,924,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FrenchValleyVillageCenterMember
   
Building & Improvements 16,856,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FrenchValleyVillageCenterMember
   
Costs Capitalized Subsequent to Acquisition 33,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FrenchValleyVillageCenterMember
   
Total Cost      
Land 11,822,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FrenchValleyVillageCenterMember
   
Building & Improvements 16,992,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FrenchValleyVillageCenterMember
   
Total 28,814,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FrenchValleyVillageCenterMember
   
Accumulated Depreciation 8,210,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FrenchValleyVillageCenterMember
   
Total Cost, Net of Accumulated Depreciation 20,604,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FrenchValleyVillageCenterMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FrenchValleyVillageCenterMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 28,814,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FrenchValleyVillageCenterMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 8,210,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FrenchValleyVillageCenterMember
   
Friars Mission Center [Member]      
Initial Cost      
Land 6,660,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FriarsMissionCenterMember
   
Building & Improvements 28,021,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FriarsMissionCenterMember
   
Costs Capitalized Subsequent to Acquisition 970,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FriarsMissionCenterMember
   
Total Cost      
Land 6,660,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FriarsMissionCenterMember
   
Building & Improvements 28,991,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FriarsMissionCenterMember
   
Total 35,651,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FriarsMissionCenterMember
   
Accumulated Depreciation 11,642,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FriarsMissionCenterMember
   
Total Cost, Net of Accumulated Depreciation 24,009,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FriarsMissionCenterMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 141,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FriarsMissionCenterMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 35,651,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FriarsMissionCenterMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 11,642,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_FriarsMissionCenterMember
   
Gardens Square [Member]      
Initial Cost      
Land 2,136,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GardensSquareMember
   
Building & Improvements 8,273,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GardensSquareMember
   
Costs Capitalized Subsequent to Acquisition 399,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GardensSquareMember
   
Total Cost      
Land 2,136,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GardensSquareMember
   
Building & Improvements 8,672,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GardensSquareMember
   
Total 10,808,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GardensSquareMember
   
Accumulated Depreciation 3,973,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GardensSquareMember
   
Total Cost, Net of Accumulated Depreciation 6,835,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GardensSquareMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GardensSquareMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 10,808,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GardensSquareMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 3,973,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GardensSquareMember
   
Gateway 101 [Member]      
Initial Cost      
Land 24,971,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_Gateway101Member
   
Building & Improvements 9,113,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_Gateway101Member
   
Costs Capitalized Subsequent to Acquisition 24,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_Gateway101Member
   
Total Cost      
Land 24,971,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_Gateway101Member
   
Building & Improvements 9,137,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_Gateway101Member
   
Total 34,108,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_Gateway101Member
   
Accumulated Depreciation 2,684,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_Gateway101Member
   
Total Cost, Net of Accumulated Depreciation 31,424,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_Gateway101Member
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_Gateway101Member
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 34,108,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_Gateway101Member
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 2,684,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_Gateway101Member
   
Gateway Shopping Center [Member]      
Initial Cost      
Land 52,665,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GatewayShoppingCenterMember
   
Building & Improvements 7,134,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GatewayShoppingCenterMember
   
Costs Capitalized Subsequent to Acquisition 1,883,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GatewayShoppingCenterMember
   
Total Cost      
Land 52,671,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GatewayShoppingCenterMember
   
Building & Improvements 9,011,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GatewayShoppingCenterMember
   
Total 61,682,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GatewayShoppingCenterMember
   
Accumulated Depreciation 9,648,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GatewayShoppingCenterMember
   
Total Cost, Net of Accumulated Depreciation 52,034,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GatewayShoppingCenterMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GatewayShoppingCenterMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 61,682,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GatewayShoppingCenterMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 9,648,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GatewayShoppingCenterMember
   
Gelson's Westlake Market Plaza [Member]      
Initial Cost      
Land 3,157,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GelsonsWestlakeMarketPlazaMember
   
Building & Improvements 11,153,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GelsonsWestlakeMarketPlazaMember
   
Costs Capitalized Subsequent to Acquisition 372,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GelsonsWestlakeMarketPlazaMember
   
Total Cost      
Land 3,157,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GelsonsWestlakeMarketPlazaMember
   
Building & Improvements 11,525,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GelsonsWestlakeMarketPlazaMember
   
Total 14,682,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GelsonsWestlakeMarketPlazaMember
   
Accumulated Depreciation 4,506,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GelsonsWestlakeMarketPlazaMember
   
Total Cost, Net of Accumulated Depreciation 10,176,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GelsonsWestlakeMarketPlazaMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GelsonsWestlakeMarketPlazaMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 14,682,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GelsonsWestlakeMarketPlazaMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 4,506,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GelsonsWestlakeMarketPlazaMember
   
Glen Gate [Member]      
Initial Cost      
Land 13,241,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GlenGateMember
   
Building & Improvements 11,968,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GlenGateMember
   
Costs Capitalized Subsequent to Acquisition 2,717,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GlenGateMember
   
Total Cost      
Land 13,241,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GlenGateMember
   
Building & Improvements 14,685,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GlenGateMember
   
Total 27,926,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GlenGateMember
   
Accumulated Depreciation 71,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GlenGateMember
   
Total Cost, Net of Accumulated Depreciation 27,855,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GlenGateMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GlenGateMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 27,926,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GlenGateMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 71,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GlenGateMember
   
Glen Oak Plaza [Member]      
Initial Cost      
Land 4,103,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GlenOakPlazaMember
   
Building & Improvements 12,951,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GlenOakPlazaMember
   
Costs Capitalized Subsequent to Acquisition 327,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GlenOakPlazaMember
   
Total Cost      
Land 4,103,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GlenOakPlazaMember
   
Building & Improvements 13,278,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GlenOakPlazaMember
   
Total 17,381,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GlenOakPlazaMember
   
Accumulated Depreciation 2,036,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GlenOakPlazaMember
   
Total Cost, Net of Accumulated Depreciation 15,345,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GlenOakPlazaMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GlenOakPlazaMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 17,381,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GlenOakPlazaMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 2,036,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GlenOakPlazaMember
   
Glenwood Village [Member]      
Initial Cost      
Land 1,194,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GlenwoodVillageMember
   
Building & Improvements 5,381,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GlenwoodVillageMember
   
Costs Capitalized Subsequent to Acquisition 220,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GlenwoodVillageMember
   
Total Cost      
Land 1,194,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GlenwoodVillageMember
   
Building & Improvements 5,601,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GlenwoodVillageMember
   
Total 6,795,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GlenwoodVillageMember
   
Accumulated Depreciation 3,505,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GlenwoodVillageMember
   
Total Cost, Net of Accumulated Depreciation 3,290,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GlenwoodVillageMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GlenwoodVillageMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 6,795,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GlenwoodVillageMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 3,505,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GlenwoodVillageMember
   
Golden Hills Plaza [Member]      
Initial Cost      
Land 12,699,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GoldenHillsPlazaMember
   
Building & Improvements 18,482,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GoldenHillsPlazaMember
   
Costs Capitalized Subsequent to Acquisition 3,375,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GoldenHillsPlazaMember
   
Total Cost      
Land 12,693,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GoldenHillsPlazaMember
   
Building & Improvements 21,863,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GoldenHillsPlazaMember
   
Total 34,556,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GoldenHillsPlazaMember
   
Accumulated Depreciation 4,765,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GoldenHillsPlazaMember
   
Total Cost, Net of Accumulated Depreciation 29,791,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GoldenHillsPlazaMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GoldenHillsPlazaMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 34,556,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GoldenHillsPlazaMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 4,765,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GoldenHillsPlazaMember
   
Grand Ridge Plaza [Member]      
Initial Cost      
Land 24,208,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GrandRidgePlazaMember
   
Building & Improvements 61,033,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GrandRidgePlazaMember
   
Costs Capitalized Subsequent to Acquisition 2,643,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GrandRidgePlazaMember
   
Total Cost      
Land 24,843,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GrandRidgePlazaMember
   
Building & Improvements 63,041,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GrandRidgePlazaMember
   
Total 87,884,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GrandRidgePlazaMember
   
Accumulated Depreciation 4,525,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GrandRidgePlazaMember
   
Total Cost, Net of Accumulated Depreciation 83,359,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GrandRidgePlazaMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 11,309,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GrandRidgePlazaMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 87,884,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GrandRidgePlazaMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 4,525,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_GrandRidgePlazaMember
   
Hancock [Member]      
Initial Cost      
Land 8,232,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HancockMember
   
Building & Improvements 28,260,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HancockMember
   
Costs Capitalized Subsequent to Acquisition 1,148,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HancockMember
   
Total Cost      
Land 8,232,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HancockMember
   
Building & Improvements 29,408,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HancockMember
   
Total 37,640,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HancockMember
   
Accumulated Depreciation 13,091,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HancockMember
   
Total Cost, Net of Accumulated Depreciation 24,549,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HancockMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HancockMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 37,640,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HancockMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 13,091,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HancockMember
   
Harpeth Village Fieldstone [Member]      
Initial Cost      
Land 2,284,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HarpethVillageFieldstoneMember
   
Building & Improvements 9,443,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HarpethVillageFieldstoneMember
   
Costs Capitalized Subsequent to Acquisition 166,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HarpethVillageFieldstoneMember
   
Total Cost      
Land 2,284,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HarpethVillageFieldstoneMember
   
Building & Improvements 9,609,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HarpethVillageFieldstoneMember
   
Total 11,893,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HarpethVillageFieldstoneMember
   
Accumulated Depreciation 4,129,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HarpethVillageFieldstoneMember
   
Total Cost, Net of Accumulated Depreciation 7,764,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HarpethVillageFieldstoneMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HarpethVillageFieldstoneMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 11,893,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HarpethVillageFieldstoneMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 4,129,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HarpethVillageFieldstoneMember
   
Harris Crossing [Member]      
Initial Cost      
Land 7,199,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HarrisCrossingMember
   
Building & Improvements 3,677,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HarrisCrossingMember
   
Costs Capitalized Subsequent to Acquisition 8,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HarrisCrossingMember
   
Total Cost      
Land 7,162,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HarrisCrossingMember
   
Building & Improvements 3,722,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HarrisCrossingMember
   
Total 10,884,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HarrisCrossingMember
   
Accumulated Depreciation 1,454,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HarrisCrossingMember
   
Total Cost, Net of Accumulated Depreciation 9,430,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HarrisCrossingMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HarrisCrossingMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 10,884,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HarrisCrossingMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 1,454,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HarrisCrossingMember
   
Heritage Land [Member]      
Initial Cost      
Land 12,390,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HeritageLandMember
   
Building & Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HeritageLandMember
   
Costs Capitalized Subsequent to Acquisition (453,000)us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HeritageLandMember
   
Total Cost      
Land 11,937,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HeritageLandMember
   
Building & Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HeritageLandMember
   
Total 11,937,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HeritageLandMember
   
Accumulated Depreciation 0us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HeritageLandMember
   
Total Cost, Net of Accumulated Depreciation 11,937,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HeritageLandMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HeritageLandMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 11,937,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HeritageLandMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 0us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HeritageLandMember
   
Heritage Plaza [Member]      
Initial Cost      
Land 0us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HeritagePlazaMember
   
Building & Improvements 26,097,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HeritagePlazaMember
   
Costs Capitalized Subsequent to Acquisition 13,366,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HeritagePlazaMember
   
Total Cost      
Land 278,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HeritagePlazaMember
   
Building & Improvements 39,185,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HeritagePlazaMember
   
Total 39,463,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HeritagePlazaMember
   
Accumulated Depreciation 13,048,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HeritagePlazaMember
   
Total Cost, Net of Accumulated Depreciation 26,415,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HeritagePlazaMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HeritagePlazaMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 39,463,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HeritagePlazaMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 13,048,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HeritagePlazaMember
   
Hershey [Member]      
Initial Cost      
Land 7,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HersheyMember
   
Building & Improvements 808,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HersheyMember
   
Costs Capitalized Subsequent to Acquisition 6,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HersheyMember
   
Total Cost      
Land 7,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HersheyMember
   
Building & Improvements 815,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HersheyMember
   
Total 822,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HersheyMember
   
Accumulated Depreciation 293,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HersheyMember
   
Total Cost, Net of Accumulated Depreciation 529,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HersheyMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HersheyMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 822,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HersheyMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 293,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HersheyMember
   
Hibernia Pavilion [Member]      
Initial Cost      
Land 4,929,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HiberniaPavilionMember
   
Building & Improvements 5,065,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HiberniaPavilionMember
   
Costs Capitalized Subsequent to Acquisition (1,000)us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HiberniaPavilionMember
   
Total Cost      
Land 4,929,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HiberniaPavilionMember
   
Building & Improvements 5,064,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HiberniaPavilionMember
   
Total 9,993,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HiberniaPavilionMember
   
Accumulated Depreciation 1,800,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HiberniaPavilionMember
   
Total Cost, Net of Accumulated Depreciation 8,193,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HiberniaPavilionMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HiberniaPavilionMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 9,993,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HiberniaPavilionMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 1,800,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HiberniaPavilionMember
   
Hibernia Plaza [Member]      
Initial Cost      
Land 267,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HiberniaPlazaMember
   
Building & Improvements 230,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HiberniaPlazaMember
   
Costs Capitalized Subsequent to Acquisition (8,000)us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HiberniaPlazaMember
   
Total Cost      
Land 267,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HiberniaPlazaMember
   
Building & Improvements 222,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HiberniaPlazaMember
   
Total 489,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HiberniaPlazaMember
   
Accumulated Depreciation 51,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HiberniaPlazaMember
   
Total Cost, Net of Accumulated Depreciation 438,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HiberniaPlazaMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HiberniaPlazaMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 489,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HiberniaPlazaMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 51,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HiberniaPlazaMember
   
Hickory Creek Plaza [Member]      
Initial Cost      
Land 5,629,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HickoryCreekPlazaMember
   
Building & Improvements 4,564,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HickoryCreekPlazaMember
   
Costs Capitalized Subsequent to Acquisition 275,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HickoryCreekPlazaMember
   
Total Cost      
Land 5,629,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HickoryCreekPlazaMember
   
Building & Improvements 4,839,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HickoryCreekPlazaMember
   
Total 10,468,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HickoryCreekPlazaMember
   
Accumulated Depreciation 2,552,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HickoryCreekPlazaMember
   
Total Cost, Net of Accumulated Depreciation 7,916,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HickoryCreekPlazaMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HickoryCreekPlazaMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 10,468,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HickoryCreekPlazaMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 2,552,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HickoryCreekPlazaMember
   
Hillcrest Village [Member]      
Initial Cost      
Land 1,600,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HillcrestVillageMember
   
Building & Improvements 1,909,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HillcrestVillageMember
   
Costs Capitalized Subsequent to Acquisition 51,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HillcrestVillageMember
   
Total Cost      
Land 1,600,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HillcrestVillageMember
   
Building & Improvements 1,960,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HillcrestVillageMember
   
Total 3,560,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HillcrestVillageMember
   
Accumulated Depreciation 795,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HillcrestVillageMember
   
Total Cost, Net of Accumulated Depreciation 2,765,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HillcrestVillageMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HillcrestVillageMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 3,560,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HillcrestVillageMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 795,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HillcrestVillageMember
   
Hilltop Village [Member]      
Initial Cost      
Land 2,995,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HilltopVillageMember
   
Building & Improvements 4,581,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HilltopVillageMember
   
Costs Capitalized Subsequent to Acquisition 907,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HilltopVillageMember
   
Total Cost      
Land 3,089,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HilltopVillageMember
   
Building & Improvements 5,394,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HilltopVillageMember
   
Total 8,483,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HilltopVillageMember
   
Accumulated Depreciation 619,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HilltopVillageMember
   
Total Cost, Net of Accumulated Depreciation 7,864,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HilltopVillageMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 7,500,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HilltopVillageMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 8,483,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HilltopVillageMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 619,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HilltopVillageMember
   
Hinsdale [Member]      
Initial Cost      
Land 5,734,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HinsdaleMember
   
Building & Improvements 16,709,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HinsdaleMember
   
Costs Capitalized Subsequent to Acquisition 1,812,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HinsdaleMember
   
Total Cost      
Land 5,734,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HinsdaleMember
   
Building & Improvements 18,521,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HinsdaleMember
   
Total 24,255,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HinsdaleMember
   
Accumulated Depreciation 8,198,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HinsdaleMember
   
Total Cost, Net of Accumulated Depreciation 16,057,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HinsdaleMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HinsdaleMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 24,255,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HinsdaleMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 8,198,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HinsdaleMember
   
Holly Park [Member]      
Initial Cost      
Land 8,975,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HollyParkMember
   
Building & Improvements 23,799,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HollyParkMember
   
Costs Capitalized Subsequent to Acquisition (181,000)us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HollyParkMember
   
Total Cost      
Land 8,828,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HollyParkMember
   
Building & Improvements 23,765,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HollyParkMember
   
Total 32,593,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HollyParkMember
   
Accumulated Depreciation 962,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HollyParkMember
   
Total Cost, Net of Accumulated Depreciation 31,631,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HollyParkMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HollyParkMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 32,593,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HollyParkMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 962,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HollyParkMember
   
Howell Mill Village [Member]      
Initial Cost      
Land 5,157,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HowellMillVillageMember
   
Building & Improvements 14,279,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HowellMillVillageMember
   
Costs Capitalized Subsequent to Acquisition 1,983,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HowellMillVillageMember
   
Total Cost      
Land 5,157,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HowellMillVillageMember
   
Building & Improvements 16,261,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HowellMillVillageMember
   
Total 21,418,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HowellMillVillageMember
   
Accumulated Depreciation 3,358,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HowellMillVillageMember
   
Total Cost, Net of Accumulated Depreciation 18,060,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HowellMillVillageMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HowellMillVillageMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 21,418,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HowellMillVillageMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 3,358,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HowellMillVillageMember
   
Hyde Park [Member]      
Initial Cost      
Land 9,809,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HydeParkMember
   
Building & Improvements 39,905,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HydeParkMember
   
Costs Capitalized Subsequent to Acquisition 2,032,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HydeParkMember
   
Total Cost      
Land 9,809,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HydeParkMember
   
Building & Improvements 41,937,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HydeParkMember
   
Total 51,746,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HydeParkMember
   
Accumulated Depreciation 19,836,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HydeParkMember
   
Total Cost, Net of Accumulated Depreciation 31,910,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HydeParkMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HydeParkMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 51,746,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HydeParkMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 19,836,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_HydeParkMember
   
Indian Springs [Member]      
Initial Cost      
Land 24,974,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_IndianSpringsMember
   
Building & Improvements 25,903,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_IndianSpringsMember
   
Costs Capitalized Subsequent to Acquisition 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_IndianSpringsMember
   
Total Cost      
Land 24,958,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_IndianSpringsMember
   
Building & Improvements 25,919,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_IndianSpringsMember
   
Total 50,877,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_IndianSpringsMember
   
Accumulated Depreciation 81,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_IndianSpringsMember
   
Total Cost, Net of Accumulated Depreciation 50,796,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_IndianSpringsMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_IndianSpringsMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 50,877,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_IndianSpringsMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 81,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_IndianSpringsMember
   
Indio Towne Center [Member]      
Initial Cost      
Land 17,946,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_IndioTowneCenterMember
   
Building & Improvements 31,985,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_IndioTowneCenterMember
   
Costs Capitalized Subsequent to Acquisition 28,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_IndioTowneCenterMember
   
Total Cost      
Land 17,317,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_IndioTowneCenterMember
   
Building & Improvements 32,642,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_IndioTowneCenterMember
   
Total 49,959,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_IndioTowneCenterMember
   
Accumulated Depreciation 9,611,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_IndioTowneCenterMember
   
Total Cost, Net of Accumulated Depreciation 40,348,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_IndioTowneCenterMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_IndioTowneCenterMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 49,959,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_IndioTowneCenterMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 9,611,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_IndioTowneCenterMember
   
Inglewood Plaza [Member]      
Initial Cost      
Land 1,300,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_InglewoodPlazaMember
   
Building & Improvements 2,159,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_InglewoodPlazaMember
   
Costs Capitalized Subsequent to Acquisition 226,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_InglewoodPlazaMember
   
Total Cost      
Land 1,300,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_InglewoodPlazaMember
   
Building & Improvements 2,385,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_InglewoodPlazaMember
   
Total 3,685,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_InglewoodPlazaMember
   
Accumulated Depreciation 1,029,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_InglewoodPlazaMember
   
Total Cost, Net of Accumulated Depreciation 2,656,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_InglewoodPlazaMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_InglewoodPlazaMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 3,685,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_InglewoodPlazaMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 1,029,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_InglewoodPlazaMember
   
Jefferson Square [Member]      
Initial Cost      
Land 5,167,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_JeffersonSquareMember
   
Building & Improvements 6,445,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_JeffersonSquareMember
   
Costs Capitalized Subsequent to Acquisition (7,340,000)us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_JeffersonSquareMember
   
Total Cost      
Land 1,775,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_JeffersonSquareMember
   
Building & Improvements 2,497,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_JeffersonSquareMember
   
Total 4,272,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_JeffersonSquareMember
   
Accumulated Depreciation 254,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_JeffersonSquareMember
   
Total Cost, Net of Accumulated Depreciation 4,018,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_JeffersonSquareMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_JeffersonSquareMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 4,272,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_JeffersonSquareMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 254,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_JeffersonSquareMember
   
Juanita Tate Marketplace [Member]      
Initial Cost      
Land 3,886,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_JuanitaTateMarketplaceMember
   
Building & Improvements 11,315,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_JuanitaTateMarketplaceMember
   
Costs Capitalized Subsequent to Acquisition 3,263,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_JuanitaTateMarketplaceMember
   
Total Cost      
Land 4,563,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_JuanitaTateMarketplaceMember
   
Building & Improvements 13,903,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_JuanitaTateMarketplaceMember
   
Total 18,466,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_JuanitaTateMarketplaceMember
   
Accumulated Depreciation 425,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_JuanitaTateMarketplaceMember
   
Total Cost, Net of Accumulated Depreciation 18,041,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_JuanitaTateMarketplaceMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_JuanitaTateMarketplaceMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 18,466,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_JuanitaTateMarketplaceMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 425,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_JuanitaTateMarketplaceMember
   
Keller Town Center [Member]      
Initial Cost      
Land 2,294,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KellerTownCenterMember
   
Building & Improvements 12,841,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KellerTownCenterMember
   
Costs Capitalized Subsequent to Acquisition 298,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KellerTownCenterMember
   
Total Cost      
Land 2,404,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KellerTownCenterMember
   
Building & Improvements 13,030,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KellerTownCenterMember
   
Total 15,434,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KellerTownCenterMember
   
Accumulated Depreciation 5,255,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KellerTownCenterMember
   
Total Cost, Net of Accumulated Depreciation 10,179,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KellerTownCenterMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KellerTownCenterMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 15,434,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KellerTownCenterMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 5,255,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KellerTownCenterMember
   
Kent Place [Member]      
Initial Cost      
Land 4,855,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KentPlaceMember
   
Building & Improvements 3,544,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KentPlaceMember
   
Costs Capitalized Subsequent to Acquisition 793,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KentPlaceMember
   
Total Cost      
Land 5,228,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KentPlaceMember
   
Building & Improvements 3,964,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KentPlaceMember
   
Total 9,192,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KentPlaceMember
   
Accumulated Depreciation 299,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KentPlaceMember
   
Total Cost, Net of Accumulated Depreciation 8,893,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KentPlaceMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 8,250,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KentPlaceMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 9,192,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KentPlaceMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 299,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KentPlaceMember
   
Kirkwood Commons [Member]      
Initial Cost      
Land 6,772,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KirkwoodCommonsMember
   
Building & Improvements 16,224,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KirkwoodCommonsMember
   
Costs Capitalized Subsequent to Acquisition 478,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KirkwoodCommonsMember
   
Total Cost      
Land 6,802,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KirkwoodCommonsMember
   
Building & Improvements 16,672,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KirkwoodCommonsMember
   
Total 23,474,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KirkwoodCommonsMember
   
Accumulated Depreciation 2,211,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KirkwoodCommonsMember
   
Total Cost, Net of Accumulated Depreciation 21,263,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KirkwoodCommonsMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 11,038,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KirkwoodCommonsMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 23,474,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KirkwoodCommonsMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 2,211,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KirkwoodCommonsMember
   
Kroger New Albany Center [Member]      
Initial Cost      
Land 3,844,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KrogerNewAlbanyCenterMember
   
Building & Improvements 6,599,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KrogerNewAlbanyCenterMember
   
Costs Capitalized Subsequent to Acquisition 593,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KrogerNewAlbanyCenterMember
   
Total Cost      
Land 3,844,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KrogerNewAlbanyCenterMember
   
Building & Improvements 7,192,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KrogerNewAlbanyCenterMember
   
Total 11,036,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KrogerNewAlbanyCenterMember
   
Accumulated Depreciation 4,530,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KrogerNewAlbanyCenterMember
   
Total Cost, Net of Accumulated Depreciation 6,506,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KrogerNewAlbanyCenterMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KrogerNewAlbanyCenterMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 11,036,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KrogerNewAlbanyCenterMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 4,530,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KrogerNewAlbanyCenterMember
   
Kulpsville [Member]      
Initial Cost      
Land 5,518,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KulpsvilleMember
   
Building & Improvements 3,756,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KulpsvilleMember
   
Costs Capitalized Subsequent to Acquisition 152,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KulpsvilleMember
   
Total Cost      
Land 5,600,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KulpsvilleMember
   
Building & Improvements 3,826,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KulpsvilleMember
   
Total 9,426,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KulpsvilleMember
   
Accumulated Depreciation 1,246,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KulpsvilleMember
   
Total Cost, Net of Accumulated Depreciation 8,180,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KulpsvilleMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KulpsvilleMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 9,426,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KulpsvilleMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 1,246,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_KulpsvilleMember
   
Lake Pine Plaza [Member]      
Initial Cost      
Land 2,008,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LakePinePlazaMember
   
Building & Improvements 7,632,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LakePinePlazaMember
   
Costs Capitalized Subsequent to Acquisition 448,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LakePinePlazaMember
   
Total Cost      
Land 2,029,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LakePinePlazaMember
   
Building & Improvements 8,058,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LakePinePlazaMember
   
Total 10,087,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LakePinePlazaMember
   
Accumulated Depreciation 3,431,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LakePinePlazaMember
   
Total Cost, Net of Accumulated Depreciation 6,656,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LakePinePlazaMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LakePinePlazaMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 10,087,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LakePinePlazaMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 3,431,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LakePinePlazaMember
   
Lebanon Center [Member]      
Initial Cost      
Land 3,913,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LebanonCenterMember
   
Building & Improvements 7,874,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LebanonCenterMember
   
Costs Capitalized Subsequent to Acquisition 90,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LebanonCenterMember
   
Total Cost      
Land 3,913,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LebanonCenterMember
   
Building & Improvements 7,964,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LebanonCenterMember
   
Total 11,877,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LebanonCenterMember
   
Accumulated Depreciation 4,597,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LebanonCenterMember
   
Total Cost, Net of Accumulated Depreciation 7,280,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LebanonCenterMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LebanonCenterMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 11,877,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LebanonCenterMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 4,597,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LebanonCenterMember
   
Littleton Square [Member]      
Initial Cost      
Land 2,030,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LittletonSquareMember
   
Building & Improvements 8,859,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LittletonSquareMember
   
Costs Capitalized Subsequent to Acquisition (4,950,000)us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LittletonSquareMember
   
Total Cost      
Land 1,949,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LittletonSquareMember
   
Building & Improvements 3,990,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LittletonSquareMember
   
Total 5,939,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LittletonSquareMember
   
Accumulated Depreciation 1,299,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LittletonSquareMember
   
Total Cost, Net of Accumulated Depreciation 4,640,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LittletonSquareMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LittletonSquareMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 5,939,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LittletonSquareMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 1,299,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LittletonSquareMember
   
Lloyd King Center [Member]      
Initial Cost      
Land 1,779,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LloydKingCenterMember
   
Building & Improvements 10,060,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LloydKingCenterMember
   
Costs Capitalized Subsequent to Acquisition 1,070,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LloydKingCenterMember
   
Total Cost      
Land 1,779,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LloydKingCenterMember
   
Building & Improvements 11,130,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LloydKingCenterMember
   
Total 12,909,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LloydKingCenterMember
   
Accumulated Depreciation 4,747,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LloydKingCenterMember
   
Total Cost, Net of Accumulated Depreciation 8,162,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LloydKingCenterMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LloydKingCenterMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 12,909,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LloydKingCenterMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 4,747,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LloydKingCenterMember
   
Loehmanns Plaza California [Member]      
Initial Cost      
Land 5,420,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LoehmannsPlazaCaliforniaMember
   
Building & Improvements 9,450,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LoehmannsPlazaCaliforniaMember
   
Costs Capitalized Subsequent to Acquisition 696,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LoehmannsPlazaCaliforniaMember
   
Total Cost      
Land 5,420,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LoehmannsPlazaCaliforniaMember
   
Building & Improvements 10,146,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LoehmannsPlazaCaliforniaMember
   
Total 15,566,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LoehmannsPlazaCaliforniaMember
   
Accumulated Depreciation 4,462,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LoehmannsPlazaCaliforniaMember
   
Total Cost, Net of Accumulated Depreciation 11,104,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LoehmannsPlazaCaliforniaMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LoehmannsPlazaCaliforniaMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 15,566,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LoehmannsPlazaCaliforniaMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 4,462,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LoehmannsPlazaCaliforniaMember
   
Lower Nazareth Commons [Member]      
Initial Cost      
Land 15,992,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LowerNazarethCommonsMember
   
Building & Improvements 12,964,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LowerNazarethCommonsMember
   
Costs Capitalized Subsequent to Acquisition 3,248,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LowerNazarethCommonsMember
   
Total Cost      
Land 16,343,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LowerNazarethCommonsMember
   
Building & Improvements 15,861,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LowerNazarethCommonsMember
   
Total 32,204,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LowerNazarethCommonsMember
   
Accumulated Depreciation 5,257,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LowerNazarethCommonsMember
   
Total Cost, Net of Accumulated Depreciation 26,947,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LowerNazarethCommonsMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LowerNazarethCommonsMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 32,204,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LowerNazarethCommonsMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 5,257,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_LowerNazarethCommonsMember
   
Market at Colonnade Center [Member]      
Initial Cost      
Land 6,455,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketAtColonnadeCenterMember
   
Building & Improvements 9,839,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketAtColonnadeCenterMember
   
Costs Capitalized Subsequent to Acquisition (18,000)us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketAtColonnadeCenterMember
   
Total Cost      
Land 6,160,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketAtColonnadeCenterMember
   
Building & Improvements 10,115,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketAtColonnadeCenterMember
   
Total 16,275,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketAtColonnadeCenterMember
   
Accumulated Depreciation 1,812,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketAtColonnadeCenterMember
   
Total Cost, Net of Accumulated Depreciation 14,463,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketAtColonnadeCenterMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketAtColonnadeCenterMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 16,275,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketAtColonnadeCenterMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 1,812,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketAtColonnadeCenterMember
   
Market at Preston Forest [Member]      
Initial Cost      
Land 4,400,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketAtPrestonForestMember
   
Building & Improvements 11,445,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketAtPrestonForestMember
   
Costs Capitalized Subsequent to Acquisition 995,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketAtPrestonForestMember
   
Total Cost      
Land 4,400,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketAtPrestonForestMember
   
Building & Improvements 12,440,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketAtPrestonForestMember
   
Total 16,840,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketAtPrestonForestMember
   
Accumulated Depreciation 5,241,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketAtPrestonForestMember
   
Total Cost, Net of Accumulated Depreciation 11,599,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketAtPrestonForestMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketAtPrestonForestMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 16,840,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketAtPrestonForestMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 5,241,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketAtPrestonForestMember
   
Market at Round Rock [Member]      
Initial Cost      
Land 2,000,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketAtRoundRockMember
   
Building & Improvements 9,676,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketAtRoundRockMember
   
Costs Capitalized Subsequent to Acquisition 5,699,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketAtRoundRockMember
   
Total Cost      
Land 2,000,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketAtRoundRockMember
   
Building & Improvements 15,375,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketAtRoundRockMember
   
Total 17,375,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketAtRoundRockMember
   
Accumulated Depreciation 6,172,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketAtRoundRockMember
   
Total Cost, Net of Accumulated Depreciation 11,203,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketAtRoundRockMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketAtRoundRockMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 17,375,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketAtRoundRockMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 6,172,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketAtRoundRockMember
   
Marketplace Shopping Center [Member]      
Initial Cost      
Land 1,287,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketplaceShoppingCenterMember
   
Building & Improvements 5,509,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketplaceShoppingCenterMember
   
Costs Capitalized Subsequent to Acquisition 5,036,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketplaceShoppingCenterMember
   
Total Cost      
Land 1,330,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketplaceShoppingCenterMember
   
Building & Improvements 10,502,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketplaceShoppingCenterMember
   
Total 11,832,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketplaceShoppingCenterMember
   
Accumulated Depreciation 4,362,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketplaceShoppingCenterMember
   
Total Cost, Net of Accumulated Depreciation 7,470,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketplaceShoppingCenterMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketplaceShoppingCenterMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 11,832,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketplaceShoppingCenterMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 4,362,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketplaceShoppingCenterMember
   
Marketplace at Briargate [Member]      
Initial Cost      
Land 1,706,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketplaceAtBriargateMember
   
Building & Improvements 4,885,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketplaceAtBriargateMember
   
Costs Capitalized Subsequent to Acquisition 48,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketplaceAtBriargateMember
   
Total Cost      
Land 1,727,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketplaceAtBriargateMember
   
Building & Improvements 4,912,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketplaceAtBriargateMember
   
Total 6,639,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketplaceAtBriargateMember
   
Accumulated Depreciation 1,884,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketplaceAtBriargateMember
   
Total Cost, Net of Accumulated Depreciation 4,755,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketplaceAtBriargateMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketplaceAtBriargateMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 6,639,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketplaceAtBriargateMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 1,884,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MarketplaceAtBriargateMember
   
Millhopper Shopping Center [Member]      
Initial Cost      
Land 1,073,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MillhopperShoppingCenterMember
   
Building & Improvements 5,358,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MillhopperShoppingCenterMember
   
Costs Capitalized Subsequent to Acquisition 4,890,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MillhopperShoppingCenterMember
   
Total Cost      
Land 1,796,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MillhopperShoppingCenterMember
   
Building & Improvements 9,524,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MillhopperShoppingCenterMember
   
Total 11,320,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MillhopperShoppingCenterMember
   
Accumulated Depreciation 5,742,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MillhopperShoppingCenterMember
   
Total Cost, Net of Accumulated Depreciation 5,578,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MillhopperShoppingCenterMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MillhopperShoppingCenterMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 11,320,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MillhopperShoppingCenterMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 5,742,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MillhopperShoppingCenterMember
   
Mockingbird Common [Member]      
Initial Cost      
Land 3,000,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MockingbirdCommonMember
   
Building & Improvements 10,728,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MockingbirdCommonMember
   
Costs Capitalized Subsequent to Acquisition 665,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MockingbirdCommonMember
   
Total Cost      
Land 3,000,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MockingbirdCommonMember
   
Building & Improvements 11,393,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MockingbirdCommonMember
   
Total 14,393,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MockingbirdCommonMember
   
Accumulated Depreciation 5,043,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MockingbirdCommonMember
   
Total Cost, Net of Accumulated Depreciation 9,350,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MockingbirdCommonMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 10,300,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MockingbirdCommonMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 14,393,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MockingbirdCommonMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 5,043,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MockingbirdCommonMember
   
Monument Jackson Creek [Member]      
Initial Cost      
Land 2,999,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MonumentJacksonCreekMember
   
Building & Improvements 6,765,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MonumentJacksonCreekMember
   
Costs Capitalized Subsequent to Acquisition 660,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MonumentJacksonCreekMember
   
Total Cost      
Land 2,999,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MonumentJacksonCreekMember
   
Building & Improvements 7,425,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MonumentJacksonCreekMember
   
Total 10,424,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MonumentJacksonCreekMember
   
Accumulated Depreciation 4,634,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MonumentJacksonCreekMember
   
Total Cost, Net of Accumulated Depreciation 5,790,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MonumentJacksonCreekMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MonumentJacksonCreekMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 10,424,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MonumentJacksonCreekMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 4,634,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MonumentJacksonCreekMember
   
Morningside Plaza [Member]      
Initial Cost      
Land 4,300,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MorningsidePlazaMember
   
Building & Improvements 13,951,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MorningsidePlazaMember
   
Costs Capitalized Subsequent to Acquisition 547,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MorningsidePlazaMember
   
Total Cost      
Land 4,300,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MorningsidePlazaMember
   
Building & Improvements 14,498,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MorningsidePlazaMember
   
Total 18,798,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MorningsidePlazaMember
   
Accumulated Depreciation 6,251,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MorningsidePlazaMember
   
Total Cost, Net of Accumulated Depreciation 12,547,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MorningsidePlazaMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MorningsidePlazaMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 18,798,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MorningsidePlazaMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 6,251,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MorningsidePlazaMember
   
Murrayhill Marketplace [Member]      
Initial Cost      
Land 2,670,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MurrayhillMarketplaceMember
   
Building & Improvements 18,401,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MurrayhillMarketplaceMember
   
Costs Capitalized Subsequent to Acquisition 1,729,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MurrayhillMarketplaceMember
   
Total Cost      
Land 2,670,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MurrayhillMarketplaceMember
   
Building & Improvements 20,130,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MurrayhillMarketplaceMember
   
Total 22,800,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MurrayhillMarketplaceMember
   
Accumulated Depreciation 8,360,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MurrayhillMarketplaceMember
   
Total Cost, Net of Accumulated Depreciation 14,440,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MurrayhillMarketplaceMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MurrayhillMarketplaceMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 22,800,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MurrayhillMarketplaceMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 8,360,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_MurrayhillMarketplaceMember
   
Naples Walk [Member]      
Initial Cost      
Land 18,173,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NaplesWalkMember
   
Building & Improvements 13,554,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NaplesWalkMember
   
Costs Capitalized Subsequent to Acquisition 387,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NaplesWalkMember
   
Total Cost      
Land 18,173,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NaplesWalkMember
   
Building & Improvements 13,941,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NaplesWalkMember
   
Total 32,114,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NaplesWalkMember
   
Accumulated Depreciation 3,914,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NaplesWalkMember
   
Total Cost, Net of Accumulated Depreciation 28,200,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NaplesWalkMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 15,022,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NaplesWalkMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 32,114,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NaplesWalkMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 3,914,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NaplesWalkMember
   
Newberry Square [Member]      
Initial Cost      
Land 2,412,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NewberrySquareMember
   
Building & Improvements 10,150,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NewberrySquareMember
   
Costs Capitalized Subsequent to Acquisition 238,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NewberrySquareMember
   
Total Cost      
Land 2,412,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NewberrySquareMember
   
Building & Improvements 10,388,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NewberrySquareMember
   
Total 12,800,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NewberrySquareMember
   
Accumulated Depreciation 6,942,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NewberrySquareMember
   
Total Cost, Net of Accumulated Depreciation 5,858,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NewberrySquareMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NewberrySquareMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 12,800,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NewberrySquareMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 6,942,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NewberrySquareMember
   
Newland Center [Member]      
Initial Cost      
Land 12,500,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NewlandCenterMember
   
Building & Improvements 10,697,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NewlandCenterMember
   
Costs Capitalized Subsequent to Acquisition 684,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NewlandCenterMember
   
Total Cost      
Land 12,500,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NewlandCenterMember
   
Building & Improvements 11,381,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NewlandCenterMember
   
Total 23,881,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NewlandCenterMember
   
Accumulated Depreciation 5,387,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NewlandCenterMember
   
Total Cost, Net of Accumulated Depreciation 18,494,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NewlandCenterMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NewlandCenterMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 23,881,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NewlandCenterMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 5,387,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NewlandCenterMember
   
Nocatee Town Center [Member]      
Initial Cost      
Land 10,124,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NocateeTownCenterMember
   
Building & Improvements 8,691,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NocateeTownCenterMember
   
Costs Capitalized Subsequent to Acquisition (1,505,000)us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NocateeTownCenterMember
   
Total Cost      
Land 8,386,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NocateeTownCenterMember
   
Building & Improvements 8,924,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NocateeTownCenterMember
   
Total 17,310,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NocateeTownCenterMember
   
Accumulated Depreciation 2,256,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NocateeTownCenterMember
   
Total Cost, Net of Accumulated Depreciation 15,054,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NocateeTownCenterMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NocateeTownCenterMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 17,310,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NocateeTownCenterMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 2,256,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NocateeTownCenterMember
   
North Hills [Member]      
Initial Cost      
Land 4,900,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthHillsMember
   
Building & Improvements 19,774,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthHillsMember
   
Costs Capitalized Subsequent to Acquisition 1,056,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthHillsMember
   
Total Cost      
Land 4,900,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthHillsMember
   
Building & Improvements 20,830,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthHillsMember
   
Total 25,730,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthHillsMember
   
Accumulated Depreciation 8,765,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthHillsMember
   
Total Cost, Net of Accumulated Depreciation 16,965,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthHillsMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthHillsMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 25,730,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthHillsMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 8,765,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthHillsMember
   
Northgate Marketplace [Member]      
Initial Cost      
Land 5,668,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthgateMarketplaceMember
   
Building & Improvements 13,727,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthgateMarketplaceMember
   
Costs Capitalized Subsequent to Acquisition 1,104,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthgateMarketplaceMember
   
Total Cost      
Land 6,232,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthgateMarketplaceMember
   
Building & Improvements 14,267,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthgateMarketplaceMember
   
Total 20,499,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthgateMarketplaceMember
   
Accumulated Depreciation 1,861,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthgateMarketplaceMember
   
Total Cost, Net of Accumulated Depreciation 18,638,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthgateMarketplaceMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthgateMarketplaceMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 20,499,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthgateMarketplaceMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 1,861,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthgateMarketplaceMember
   
Northgate Plaza (Maxtown Road) [Member]      
Initial Cost      
Land 1,769,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthgatePlazaMaxtownRoadMember
   
Building & Improvements 6,652,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthgatePlazaMaxtownRoadMember
   
Costs Capitalized Subsequent to Acquisition 196,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthgatePlazaMaxtownRoadMember
   
Total Cost      
Land 1,769,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthgatePlazaMaxtownRoadMember
   
Building & Improvements 6,849,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthgatePlazaMaxtownRoadMember
   
Total 8,618,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthgatePlazaMaxtownRoadMember
   
Accumulated Depreciation 3,218,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthgatePlazaMaxtownRoadMember
   
Total Cost, Net of Accumulated Depreciation 5,400,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthgatePlazaMaxtownRoadMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthgatePlazaMaxtownRoadMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 8,618,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthgatePlazaMaxtownRoadMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 3,218,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthgatePlazaMaxtownRoadMember
   
Northgate Square [Member]      
Initial Cost      
Land 5,011,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthgateSquareMember
   
Building & Improvements 8,692,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthgateSquareMember
   
Costs Capitalized Subsequent to Acquisition 389,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthgateSquareMember
   
Total Cost      
Land 5,011,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthgateSquareMember
   
Building & Improvements 9,081,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthgateSquareMember
   
Total 14,092,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthgateSquareMember
   
Accumulated Depreciation 2,538,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthgateSquareMember
   
Total Cost, Net of Accumulated Depreciation 11,554,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthgateSquareMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthgateSquareMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 14,092,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthgateSquareMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 2,538,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthgateSquareMember
   
Northlake Village [Member]      
Initial Cost      
Land 2,662,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthlakeVillageMember
   
Building & Improvements 11,284,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthlakeVillageMember
   
Costs Capitalized Subsequent to Acquisition 1,202,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthlakeVillageMember
   
Total Cost      
Land 2,686,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthlakeVillageMember
   
Building & Improvements 12,462,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthlakeVillageMember
   
Total 15,148,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthlakeVillageMember
   
Accumulated Depreciation 4,932,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthlakeVillageMember
   
Total Cost, Net of Accumulated Depreciation 10,216,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthlakeVillageMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthlakeVillageMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 15,148,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthlakeVillageMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 4,932,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_NorthlakeVillageMember
   
Oak Shade Town Center [Member]      
Initial Cost      
Land 6,591,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OakShadeTownCenterMember
   
Building & Improvements 28,966,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OakShadeTownCenterMember
   
Costs Capitalized Subsequent to Acquisition 391,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OakShadeTownCenterMember
   
Total Cost      
Land 6,591,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OakShadeTownCenterMember
   
Building & Improvements 29,357,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OakShadeTownCenterMember
   
Total 35,948,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OakShadeTownCenterMember
   
Accumulated Depreciation 3,573,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OakShadeTownCenterMember
   
Total Cost, Net of Accumulated Depreciation 32,375,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OakShadeTownCenterMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 9,692,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OakShadeTownCenterMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 35,948,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OakShadeTownCenterMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 3,573,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OakShadeTownCenterMember
   
Oakbrook Plaza [Member]      
Initial Cost      
Land 4,000,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OakbrookPlazaMember
   
Building & Improvements 6,668,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OakbrookPlazaMember
   
Costs Capitalized Subsequent to Acquisition 306,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OakbrookPlazaMember
   
Total Cost      
Land 4,000,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OakbrookPlazaMember
   
Building & Improvements 6,974,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OakbrookPlazaMember
   
Total 10,974,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OakbrookPlazaMember
   
Accumulated Depreciation 3,023,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OakbrookPlazaMember
   
Total Cost, Net of Accumulated Depreciation 7,951,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OakbrookPlazaMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OakbrookPlazaMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 10,974,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OakbrookPlazaMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 3,023,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OakbrookPlazaMember
   
Oakleaf Commons [Member]      
Initial Cost      
Land 3,503,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OakleafCommonsMember
   
Building & Improvements 11,671,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OakleafCommonsMember
   
Costs Capitalized Subsequent to Acquisition 288,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OakleafCommonsMember
   
Total Cost      
Land 3,510,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OakleafCommonsMember
   
Building & Improvements 11,952,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OakleafCommonsMember
   
Total 15,462,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OakleafCommonsMember
   
Accumulated Depreciation 3,804,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OakleafCommonsMember
   
Total Cost, Net of Accumulated Depreciation 11,658,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OakleafCommonsMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OakleafCommonsMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 15,462,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OakleafCommonsMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 3,804,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OakleafCommonsMember
   
Ocala Corners [Member]      
Initial Cost      
Land 1,816,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OcalaCornersMember
   
Building & Improvements 10,515,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OcalaCornersMember
   
Costs Capitalized Subsequent to Acquisition 206,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OcalaCornersMember
   
Total Cost      
Land 1,816,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OcalaCornersMember
   
Building & Improvements 10,721,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OcalaCornersMember
   
Total 12,537,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OcalaCornersMember
   
Accumulated Depreciation 1,679,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OcalaCornersMember
   
Total Cost, Net of Accumulated Depreciation 10,858,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OcalaCornersMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 5,025,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OcalaCornersMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 12,537,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OcalaCornersMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 1,679,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OcalaCornersMember
   
Old St Augustine Plaza [Member]      
Initial Cost      
Land 2,368,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OldStAugustinePlazaMember
   
Building & Improvements 11,405,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OldStAugustinePlazaMember
   
Costs Capitalized Subsequent to Acquisition 201,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OldStAugustinePlazaMember
   
Total Cost      
Land 2,368,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OldStAugustinePlazaMember
   
Building & Improvements 11,606,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OldStAugustinePlazaMember
   
Total 13,974,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OldStAugustinePlazaMember
   
Accumulated Depreciation 5,649,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OldStAugustinePlazaMember
   
Total Cost, Net of Accumulated Depreciation 8,325,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OldStAugustinePlazaMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OldStAugustinePlazaMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 13,974,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OldStAugustinePlazaMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 5,649,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_OldStAugustinePlazaMember
   
Paces Ferry Plaza [Member]      
Initial Cost      
Land 2,812,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PacesFerryPlazaMember
   
Building & Improvements 12,639,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PacesFerryPlazaMember
   
Costs Capitalized Subsequent to Acquisition 334,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PacesFerryPlazaMember
   
Total Cost      
Land 2,812,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PacesFerryPlazaMember
   
Building & Improvements 12,974,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PacesFerryPlazaMember
   
Total 15,786,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PacesFerryPlazaMember
   
Accumulated Depreciation 7,562,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PacesFerryPlazaMember
   
Total Cost, Net of Accumulated Depreciation 8,224,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PacesFerryPlazaMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PacesFerryPlazaMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 15,786,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PacesFerryPlazaMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 7,562,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PacesFerryPlazaMember
   
Panther Creek [Member]      
Initial Cost      
Land 14,414,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PantherCreekMember
   
Building & Improvements 14,748,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PantherCreekMember
   
Costs Capitalized Subsequent to Acquisition 2,872,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PantherCreekMember
   
Total Cost      
Land 15,212,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PantherCreekMember
   
Building & Improvements 16,822,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PantherCreekMember
   
Total 32,034,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PantherCreekMember
   
Accumulated Depreciation 9,370,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PantherCreekMember
   
Total Cost, Net of Accumulated Depreciation 22,664,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PantherCreekMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PantherCreekMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 32,034,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PantherCreekMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 9,370,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PantherCreekMember
   
Peartree Village [Member]      
Initial Cost      
Land 5,197,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PeartreeVillageMember
   
Building & Improvements 19,746,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PeartreeVillageMember
   
Costs Capitalized Subsequent to Acquisition 796,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PeartreeVillageMember
   
Total Cost      
Land 5,197,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PeartreeVillageMember
   
Building & Improvements 20,542,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PeartreeVillageMember
   
Total 25,739,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PeartreeVillageMember
   
Accumulated Depreciation 9,761,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PeartreeVillageMember
   
Total Cost, Net of Accumulated Depreciation 15,978,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PeartreeVillageMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 7,465,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PeartreeVillageMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 25,739,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PeartreeVillageMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 9,761,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PeartreeVillageMember
   
Pike Creek [Member]      
Initial Cost      
Land 5,153,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PikeCreekMember
   
Building & Improvements 20,652,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PikeCreekMember
   
Costs Capitalized Subsequent to Acquisition 1,583,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PikeCreekMember
   
Total Cost      
Land 5,251,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PikeCreekMember
   
Building & Improvements 22,137,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PikeCreekMember
   
Total 27,388,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PikeCreekMember
   
Accumulated Depreciation 9,772,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PikeCreekMember
   
Total Cost, Net of Accumulated Depreciation 17,616,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PikeCreekMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PikeCreekMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 27,388,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PikeCreekMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 9,772,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PikeCreekMember
   
Pima Crossing [Member]      
Initial Cost      
Land 5,800,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PimaCrossingMember
   
Building & Improvements 28,143,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PimaCrossingMember
   
Costs Capitalized Subsequent to Acquisition 1,197,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PimaCrossingMember
   
Total Cost      
Land 5,800,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PimaCrossingMember
   
Building & Improvements 29,340,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PimaCrossingMember
   
Total 35,140,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PimaCrossingMember
   
Accumulated Depreciation 12,957,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PimaCrossingMember
   
Total Cost, Net of Accumulated Depreciation 22,183,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PimaCrossingMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PimaCrossingMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 35,140,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PimaCrossingMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 12,957,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PimaCrossingMember
   
Pine Lake Village [Member]      
Initial Cost      
Land 6,300,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PineLakeVillageMember
   
Building & Improvements 10,991,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PineLakeVillageMember
   
Costs Capitalized Subsequent to Acquisition 717,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PineLakeVillageMember
   
Total Cost      
Land 6,300,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PineLakeVillageMember
   
Building & Improvements 11,708,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PineLakeVillageMember
   
Total 18,008,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PineLakeVillageMember
   
Accumulated Depreciation 5,058,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PineLakeVillageMember
   
Total Cost, Net of Accumulated Depreciation 12,950,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PineLakeVillageMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PineLakeVillageMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 18,008,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PineLakeVillageMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 5,058,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PineLakeVillageMember
   
Pine Tree Plaza [Member]      
Initial Cost      
Land 668,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PineTreePlazaMember
   
Building & Improvements 6,220,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PineTreePlazaMember
   
Costs Capitalized Subsequent to Acquisition 364,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PineTreePlazaMember
   
Total Cost      
Land 668,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PineTreePlazaMember
   
Building & Improvements 6,584,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PineTreePlazaMember
   
Total 7,252,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PineTreePlazaMember
   
Accumulated Depreciation 2,849,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PineTreePlazaMember
   
Total Cost, Net of Accumulated Depreciation 4,403,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PineTreePlazaMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PineTreePlazaMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 7,252,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PineTreePlazaMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 2,849,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PineTreePlazaMember
   
Plaza Hermosa [Member]      
Initial Cost      
Land 4,200,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PlazaHermosaMember
   
Building & Improvements 10,109,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PlazaHermosaMember
   
Costs Capitalized Subsequent to Acquisition 2,434,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PlazaHermosaMember
   
Total Cost      
Land 4,202,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PlazaHermosaMember
   
Building & Improvements 12,541,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PlazaHermosaMember
   
Total 16,743,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PlazaHermosaMember
   
Accumulated Depreciation 4,331,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PlazaHermosaMember
   
Total Cost, Net of Accumulated Depreciation 12,412,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PlazaHermosaMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 13,800,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PlazaHermosaMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 16,743,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PlazaHermosaMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 4,331,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PlazaHermosaMember
   
Powell Street Plaza [Member]      
Initial Cost      
Land 8,248,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PowellStreetPlazaMember
   
Building & Improvements 30,716,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PowellStreetPlazaMember
   
Costs Capitalized Subsequent to Acquisition 1,821,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PowellStreetPlazaMember
   
Total Cost      
Land 8,248,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PowellStreetPlazaMember
   
Building & Improvements 32,537,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PowellStreetPlazaMember
   
Total 40,785,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PowellStreetPlazaMember
   
Accumulated Depreciation 11,408,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PowellStreetPlazaMember
   
Total Cost, Net of Accumulated Depreciation 29,377,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PowellStreetPlazaMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PowellStreetPlazaMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 40,785,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PowellStreetPlazaMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 11,408,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PowellStreetPlazaMember
   
Powers Ferry Square [Member]      
Initial Cost      
Land 3,687,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PowersFerrySquareMember
   
Building & Improvements 17,965,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PowersFerrySquareMember
   
Costs Capitalized Subsequent to Acquisition 6,118,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PowersFerrySquareMember
   
Total Cost      
Land 5,289,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PowersFerrySquareMember
   
Building & Improvements 22,481,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PowersFerrySquareMember
   
Total 27,770,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PowersFerrySquareMember
   
Accumulated Depreciation 11,597,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PowersFerrySquareMember
   
Total Cost, Net of Accumulated Depreciation 16,173,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PowersFerrySquareMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PowersFerrySquareMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 27,770,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PowersFerrySquareMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 11,597,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PowersFerrySquareMember
   
Powers Ferry Village [Member]      
Initial Cost      
Land 1,191,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PowersFerryVillageMember
   
Building & Improvements 4,672,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PowersFerryVillageMember
   
Costs Capitalized Subsequent to Acquisition 438,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PowersFerryVillageMember
   
Total Cost      
Land 1,191,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PowersFerryVillageMember
   
Building & Improvements 5,110,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PowersFerryVillageMember
   
Total 6,301,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PowersFerryVillageMember
   
Accumulated Depreciation 2,971,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PowersFerryVillageMember
   
Total Cost, Net of Accumulated Depreciation 3,330,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PowersFerryVillageMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PowersFerryVillageMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 6,301,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PowersFerryVillageMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 2,971,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PowersFerryVillageMember
   
Prairie City Crossing [Member]      
Initial Cost      
Land 4,164,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PrairieCityCrossingMember
   
Building & Improvements 13,032,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PrairieCityCrossingMember
   
Costs Capitalized Subsequent to Acquisition 393,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PrairieCityCrossingMember
   
Total Cost      
Land 4,164,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PrairieCityCrossingMember
   
Building & Improvements 13,425,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PrairieCityCrossingMember
   
Total 17,589,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PrairieCityCrossingMember
   
Accumulated Depreciation 4,782,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PrairieCityCrossingMember
   
Total Cost, Net of Accumulated Depreciation 12,807,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PrairieCityCrossingMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PrairieCityCrossingMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 17,589,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PrairieCityCrossingMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 4,782,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PrairieCityCrossingMember
   
Prestonbrook [Member]      
Initial Cost      
Land 7,069,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PrestonbrookMember
   
Building & Improvements 8,622,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PrestonbrookMember
   
Costs Capitalized Subsequent to Acquisition 232,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PrestonbrookMember
   
Total Cost      
Land 7,069,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PrestonbrookMember
   
Building & Improvements 8,854,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PrestonbrookMember
   
Total 15,923,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PrestonbrookMember
   
Accumulated Depreciation 5,712,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PrestonbrookMember
   
Total Cost, Net of Accumulated Depreciation 10,211,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PrestonbrookMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 6,800,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PrestonbrookMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 15,923,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PrestonbrookMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 5,712,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PrestonbrookMember
   
Preston Park [Member]      
Initial Cost      
Land 763,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PrestonParkMember
   
Building & Improvements 30,438,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PrestonParkMember
   
Costs Capitalized Subsequent to Acquisition 129,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PrestonParkMember
   
Total Cost      
Land 763,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PrestonParkMember
   
Building & Improvements 30,567,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PrestonParkMember
   
Total 31,330,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PrestonParkMember
   
Accumulated Depreciation 1,504,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PrestonParkMember
   
Total Cost, Net of Accumulated Depreciation 29,826,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PrestonParkMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PrestonParkMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 31,330,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PrestonParkMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 1,504,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PrestonParkMember
   
Red Bank [Member]      
Initial Cost      
Land 10,336,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RedBankMember
   
Building & Improvements 9,505,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RedBankMember
   
Costs Capitalized Subsequent to Acquisition (115,000)us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RedBankMember
   
Total Cost      
Land 10,110,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RedBankMember
   
Building & Improvements 9,616,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RedBankMember
   
Total 19,726,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RedBankMember
   
Accumulated Depreciation 1,635,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RedBankMember
   
Total Cost, Net of Accumulated Depreciation 18,091,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RedBankMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RedBankMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 19,726,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RedBankMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 1,635,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RedBankMember
   
Regency Commons [Member]      
Initial Cost      
Land 3,917,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RegencyCommonsMember
   
Building & Improvements 3,616,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RegencyCommonsMember
   
Costs Capitalized Subsequent to Acquisition 210,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RegencyCommonsMember
   
Total Cost      
Land 3,917,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RegencyCommonsMember
   
Building & Improvements 3,826,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RegencyCommonsMember
   
Total 7,743,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RegencyCommonsMember
   
Accumulated Depreciation 1,790,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RegencyCommonsMember
   
Total Cost, Net of Accumulated Depreciation 5,953,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RegencyCommonsMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RegencyCommonsMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 7,743,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RegencyCommonsMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 1,790,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RegencyCommonsMember
   
Regency Solar (Saugus) [Member]      
Initial Cost      
Land 0us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RegencySolarSaugusMember
   
Building & Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RegencySolarSaugusMember
   
Costs Capitalized Subsequent to Acquisition 758,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RegencySolarSaugusMember
   
Total Cost      
Land 6,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RegencySolarSaugusMember
   
Building & Improvements 752,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RegencySolarSaugusMember
   
Total 758,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RegencySolarSaugusMember
   
Accumulated Depreciation 59,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RegencySolarSaugusMember
   
Total Cost, Net of Accumulated Depreciation 699,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RegencySolarSaugusMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RegencySolarSaugusMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 758,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RegencySolarSaugusMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 59,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RegencySolarSaugusMember
   
Regency Square [Member]      
Initial Cost      
Land 4,770,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RegencySquareMember
   
Building & Improvements 25,191,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RegencySquareMember
   
Costs Capitalized Subsequent to Acquisition 4,391,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RegencySquareMember
   
Total Cost      
Land 5,060,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RegencySquareMember
   
Building & Improvements 29,292,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RegencySquareMember
   
Total 34,352,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RegencySquareMember
   
Accumulated Depreciation 19,735,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RegencySquareMember
   
Total Cost, Net of Accumulated Depreciation 14,617,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RegencySquareMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RegencySquareMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 34,352,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RegencySquareMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 19,735,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RegencySquareMember
   
Rona Plaza [Member]      
Initial Cost      
Land 1,500,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RonaPlazaMember
   
Building & Improvements 4,917,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RonaPlazaMember
   
Costs Capitalized Subsequent to Acquisition 217,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RonaPlazaMember
   
Total Cost      
Land 1,500,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RonaPlazaMember
   
Building & Improvements 5,134,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RonaPlazaMember
   
Total 6,634,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RonaPlazaMember
   
Accumulated Depreciation 2,476,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RonaPlazaMember
   
Total Cost, Net of Accumulated Depreciation 4,158,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RonaPlazaMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RonaPlazaMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 6,634,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RonaPlazaMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 2,476,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RonaPlazaMember
   
San Leandro Plaza [Member]      
Initial Cost      
Land 1,300,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SanLeandroPlazaMember
   
Building & Improvements 8,226,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SanLeandroPlazaMember
   
Costs Capitalized Subsequent to Acquisition 472,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SanLeandroPlazaMember
   
Total Cost      
Land 1,300,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SanLeandroPlazaMember
   
Building & Improvements 8,698,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SanLeandroPlazaMember
   
Total 9,998,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SanLeandroPlazaMember
   
Accumulated Depreciation 3,519,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SanLeandroPlazaMember
   
Total Cost, Net of Accumulated Depreciation 6,479,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SanLeandroPlazaMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SanLeandroPlazaMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 9,998,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SanLeandroPlazaMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 3,519,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SanLeandroPlazaMember
   
Sandy Springs [Member]      
Initial Cost      
Land 6,889,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SandySpringsMember
   
Building & Improvements 28,056,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SandySpringsMember
   
Costs Capitalized Subsequent to Acquisition 1,195,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SandySpringsMember
   
Total Cost      
Land 6,889,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SandySpringsMember
   
Building & Improvements 29,251,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SandySpringsMember
   
Total 36,140,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SandySpringsMember
   
Accumulated Depreciation 2,176,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SandySpringsMember
   
Total Cost, Net of Accumulated Depreciation 33,964,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SandySpringsMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 16,079,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SandySpringsMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 36,140,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SandySpringsMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 2,176,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SandySpringsMember
   
Saugus [Member]      
Initial Cost      
Land 19,201,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SaugusMember
   
Building & Improvements 17,984,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SaugusMember
   
Costs Capitalized Subsequent to Acquisition (1,120,000)us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SaugusMember
   
Total Cost      
Land 18,805,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SaugusMember
   
Building & Improvements 17,260,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SaugusMember
   
Total 36,065,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SaugusMember
   
Accumulated Depreciation 5,552,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SaugusMember
   
Total Cost, Net of Accumulated Depreciation 30,513,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SaugusMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SaugusMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 36,065,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SaugusMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 5,552,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SaugusMember
   
Seminole Shoppes [Member]      
Initial Cost      
Land 8,593,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SeminoleShoppesMember
   
Building & Improvements 7,523,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SeminoleShoppesMember
   
Costs Capitalized Subsequent to Acquisition 94,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SeminoleShoppesMember
   
Total Cost      
Land 8,629,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SeminoleShoppesMember
   
Building & Improvements 7,581,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SeminoleShoppesMember
   
Total 16,210,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SeminoleShoppesMember
   
Accumulated Depreciation 1,561,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SeminoleShoppesMember
   
Total Cost, Net of Accumulated Depreciation 14,649,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SeminoleShoppesMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 9,958,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SeminoleShoppesMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 16,210,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SeminoleShoppesMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 1,561,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SeminoleShoppesMember
   
Sequoia Station [Member]      
Initial Cost      
Land 9,100,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SequoiaStationMember
   
Building & Improvements 18,356,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SequoiaStationMember
   
Costs Capitalized Subsequent to Acquisition 1,394,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SequoiaStationMember
   
Total Cost      
Land 9,100,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SequoiaStationMember
   
Building & Improvements 19,750,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SequoiaStationMember
   
Total 28,850,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SequoiaStationMember
   
Accumulated Depreciation 7,949,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SequoiaStationMember
   
Total Cost, Net of Accumulated Depreciation 20,901,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SequoiaStationMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 21,100,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SequoiaStationMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 28,850,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SequoiaStationMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 7,949,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SequoiaStationMember
   
Sherwood Market Center [Member]      
Initial Cost      
Land 2,731,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SherwoodMarketCenterMember
   
Building & Improvements 6,360,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SherwoodMarketCenterMember
   
Costs Capitalized Subsequent to Acquisition 492,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SherwoodMarketCenterMember
   
Total Cost      
Land 2,731,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SherwoodMarketCenterMember
   
Building & Improvements 6,852,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SherwoodMarketCenterMember
   
Total 9,583,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SherwoodMarketCenterMember
   
Accumulated Depreciation 2,183,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SherwoodMarketCenterMember
   
Total Cost, Net of Accumulated Depreciation 7,400,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SherwoodMarketCenterMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SherwoodMarketCenterMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 9,583,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SherwoodMarketCenterMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 2,183,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SherwoodMarketCenterMember
   
Shoppes at Fairhope Village [Member]      
Initial Cost      
Land 6,920,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShoppesAtFairhopeVillageMember
   
Building & Improvements 11,198,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShoppesAtFairhopeVillageMember
   
Costs Capitalized Subsequent to Acquisition 276,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShoppesAtFairhopeVillageMember
   
Total Cost      
Land 6,920,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShoppesAtFairhopeVillageMember
   
Building & Improvements 11,473,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShoppesAtFairhopeVillageMember
   
Total 18,393,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShoppesAtFairhopeVillageMember
   
Accumulated Depreciation 3,019,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShoppesAtFairhopeVillageMember
   
Total Cost, Net of Accumulated Depreciation 15,374,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShoppesAtFairhopeVillageMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShoppesAtFairhopeVillageMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 18,393,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShoppesAtFairhopeVillageMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 3,019,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShoppesAtFairhopeVillageMember
   
Shoppes @ 104 [Member]      
Initial Cost      
Land 11,193,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_Shoppes104Member
   
Building & Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_Shoppes104Member
   
Costs Capitalized Subsequent to Acquisition 574,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_Shoppes104Member
   
Total Cost      
Land 6,652,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_Shoppes104Member
   
Building & Improvements 5,115,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_Shoppes104Member
   
Total 11,767,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_Shoppes104Member
   
Accumulated Depreciation 1,256,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_Shoppes104Member
   
Total Cost, Net of Accumulated Depreciation 10,511,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_Shoppes104Member
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_Shoppes104Member
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 11,767,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_Shoppes104Member
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 1,256,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_Shoppes104Member
   
Shoppes of Grande Oak [Member]      
Initial Cost      
Land 5,091,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShoppesOfGrandeOakMember
   
Building & Improvements 5,985,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShoppesOfGrandeOakMember
   
Costs Capitalized Subsequent to Acquisition 218,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShoppesOfGrandeOakMember
   
Total Cost      
Land 5,091,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShoppesOfGrandeOakMember
   
Building & Improvements 6,203,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShoppesOfGrandeOakMember
   
Total 11,294,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShoppesOfGrandeOakMember
   
Accumulated Depreciation 3,944,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShoppesOfGrandeOakMember
   
Total Cost, Net of Accumulated Depreciation 7,350,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShoppesOfGrandeOakMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShoppesOfGrandeOakMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 11,294,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShoppesOfGrandeOakMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 3,944,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShoppesOfGrandeOakMember
   
Shops at Arizona [Member]      
Initial Cost      
Land 3,063,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtArizonaMember
   
Building & Improvements 3,243,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtArizonaMember
   
Costs Capitalized Subsequent to Acquisition 153,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtArizonaMember
   
Total Cost      
Land 3,063,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtArizonaMember
   
Building & Improvements 3,396,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtArizonaMember
   
Total 6,459,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtArizonaMember
   
Accumulated Depreciation 1,794,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtArizonaMember
   
Total Cost, Net of Accumulated Depreciation 4,665,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtArizonaMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtArizonaMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 6,459,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtArizonaMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 1,794,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtArizonaMember
   
Shops at County Center [Member]      
Initial Cost      
Land 9,957,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtCountyCenterMember
   
Building & Improvements 11,269,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtCountyCenterMember
   
Costs Capitalized Subsequent to Acquisition 740,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtCountyCenterMember
   
Total Cost      
Land 10,209,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtCountyCenterMember
   
Building & Improvements 11,757,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtCountyCenterMember
   
Total 21,966,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtCountyCenterMember
   
Accumulated Depreciation 5,455,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtCountyCenterMember
   
Total Cost, Net of Accumulated Depreciation 16,511,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtCountyCenterMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtCountyCenterMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 21,966,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtCountyCenterMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 5,455,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtCountyCenterMember
   
Shops at Erwin Mill [Member]      
Initial Cost      
Land 236,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtErwinMillMember
   
Building & Improvements 131,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtErwinMillMember
   
Costs Capitalized Subsequent to Acquisition 15,087,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtErwinMillMember
   
Total Cost      
Land 9,171,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtErwinMillMember
   
Building & Improvements 6,283,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtErwinMillMember
   
Total 15,454,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtErwinMillMember
   
Accumulated Depreciation 378,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtErwinMillMember
   
Total Cost, Net of Accumulated Depreciation 15,076,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtErwinMillMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 10,000,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtErwinMillMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 15,454,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtErwinMillMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 378,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtErwinMillMember
   
Shops at Johns Creek [Member]      
Initial Cost      
Land 1,863,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtJohnsCreekMember
   
Building & Improvements 2,014,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtJohnsCreekMember
   
Costs Capitalized Subsequent to Acquisition (349,000)us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtJohnsCreekMember
   
Total Cost      
Land 1,501,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtJohnsCreekMember
   
Building & Improvements 2,028,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtJohnsCreekMember
   
Total 3,529,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtJohnsCreekMember
   
Accumulated Depreciation 938,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtJohnsCreekMember
   
Total Cost, Net of Accumulated Depreciation 2,591,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtJohnsCreekMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtJohnsCreekMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 3,529,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtJohnsCreekMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 938,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtJohnsCreekMember
   
Shops at Mira Vista [Member]      
Initial Cost      
Land 11,691,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsatMiraVistaMember
   
Building & Improvements 9,026,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsatMiraVistaMember
   
Costs Capitalized Subsequent to Acquisition 6,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsatMiraVistaMember
   
Total Cost      
Land 11,691,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsatMiraVistaMember
   
Building & Improvements 9,032,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsatMiraVistaMember
   
Total 20,723,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsatMiraVistaMember
   
Accumulated Depreciation 345,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsatMiraVistaMember
   
Total Cost, Net of Accumulated Depreciation 20,378,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsatMiraVistaMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 257,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsatMiraVistaMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 20,723,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsatMiraVistaMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 345,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsatMiraVistaMember
   
Shops at Quail Creek [Member]      
Initial Cost      
Land 1,487,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtQuailCreekMember
   
Building & Improvements 7,717,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtQuailCreekMember
   
Costs Capitalized Subsequent to Acquisition 438,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtQuailCreekMember
   
Total Cost      
Land 1,499,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtQuailCreekMember
   
Building & Improvements 8,143,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtQuailCreekMember
   
Total 9,642,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtQuailCreekMember
   
Accumulated Depreciation 2,061,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtQuailCreekMember
   
Total Cost, Net of Accumulated Depreciation 7,581,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtQuailCreekMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtQuailCreekMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 9,642,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtQuailCreekMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 2,061,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsAtQuailCreekMember
   
Shops on Main [Member]      
Initial Cost      
Land 15,211,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsonMainMember
   
Building & Improvements 23,030,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsonMainMember
   
Costs Capitalized Subsequent to Acquisition 1,203,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsonMainMember
   
Total Cost      
Land 15,211,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsonMainMember
   
Building & Improvements 25,589,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsonMainMember
   
Total 40,800,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsonMainMember
   
Accumulated Depreciation 1,548,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsonMainMember
   
Total Cost, Net of Accumulated Depreciation 39,252,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsonMainMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsonMainMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 40,800,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsonMainMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 1,548,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ShopsonMainMember
   
Signature Plaza [Member]      
Initial Cost      
Land 2,396,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SignaturePlazaMember
   
Building & Improvements 3,898,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SignaturePlazaMember
   
Costs Capitalized Subsequent to Acquisition (13,000)us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SignaturePlazaMember
   
Total Cost      
Land 2,396,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SignaturePlazaMember
   
Building & Improvements 3,885,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SignaturePlazaMember
   
Total 6,281,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SignaturePlazaMember
   
Accumulated Depreciation 2,025,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SignaturePlazaMember
   
Total Cost, Net of Accumulated Depreciation 4,256,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SignaturePlazaMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SignaturePlazaMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 6,281,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SignaturePlazaMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 2,025,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SignaturePlazaMember
   
South Bay Village [Member]      
Initial Cost      
Land 11,714,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthBayVillageMember
   
Building & Improvements 15,580,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthBayVillageMember
   
Costs Capitalized Subsequent to Acquisition 1,385,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthBayVillageMember
   
Total Cost      
Land 11,776,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthBayVillageMember
   
Building & Improvements 16,903,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthBayVillageMember
   
Total 28,679,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthBayVillageMember
   
Accumulated Depreciation 1,567,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthBayVillageMember
   
Total Cost, Net of Accumulated Depreciation 27,112,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthBayVillageMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthBayVillageMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 28,679,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthBayVillageMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 1,567,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthBayVillageMember
   
South Lowry square [Member]      
Initial Cost      
Land 3,434,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthLowrySquareMember
   
Building & Improvements 10,445,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthLowrySquareMember
   
Costs Capitalized Subsequent to Acquisition 789,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthLowrySquareMember
   
Total Cost      
Land 3,434,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthLowrySquareMember
   
Building & Improvements 11,234,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthLowrySquareMember
   
Total 14,668,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthLowrySquareMember
   
Accumulated Depreciation 4,781,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthLowrySquareMember
   
Total Cost, Net of Accumulated Depreciation 9,887,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthLowrySquareMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthLowrySquareMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 14,668,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthLowrySquareMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 4,781,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthLowrySquareMember
   
Southcenter [Member]      
Initial Cost      
Land 1,300,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthcenterMember
   
Building & Improvements 12,750,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthcenterMember
   
Costs Capitalized Subsequent to Acquisition 848,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthcenterMember
   
Total Cost      
Land 1,300,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthcenterMember
   
Building & Improvements 13,598,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthcenterMember
   
Total 14,898,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthcenterMember
   
Accumulated Depreciation 5,559,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthcenterMember
   
Total Cost, Net of Accumulated Depreciation 9,339,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthcenterMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthcenterMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 14,898,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthcenterMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 5,559,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthcenterMember
   
Southpark at Cinco Ranch [Member]      
Initial Cost      
Land 18,395,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthparkatCincoRanchMember
   
Building & Improvements 11,306,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthparkatCincoRanchMember
   
Costs Capitalized Subsequent to Acquisition 702,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthparkatCincoRanchMember
   
Total Cost      
Land 18,685,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthparkatCincoRanchMember
   
Building & Improvements 11,718,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthparkatCincoRanchMember
   
Total 30,403,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthparkatCincoRanchMember
   
Accumulated Depreciation 1,325,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthparkatCincoRanchMember
   
Total Cost, Net of Accumulated Depreciation 29,078,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthparkatCincoRanchMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthparkatCincoRanchMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 30,403,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthparkatCincoRanchMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 1,325,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthparkatCincoRanchMember
   
SouthPoint Crossing [Member]      
Initial Cost      
Land 4,412,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthpointCrossingMember
   
Building & Improvements 12,235,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthpointCrossingMember
   
Costs Capitalized Subsequent to Acquisition 657,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthpointCrossingMember
   
Total Cost      
Land 4,412,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthpointCrossingMember
   
Building & Improvements 12,892,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthpointCrossingMember
   
Total 17,304,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthpointCrossingMember
   
Accumulated Depreciation 5,034,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthpointCrossingMember
   
Total Cost, Net of Accumulated Depreciation 12,270,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthpointCrossingMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthpointCrossingMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 17,304,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthpointCrossingMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 5,034,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SouthpointCrossingMember
   
Starke [Member]      
Initial Cost      
Land 71,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StarkeMember
   
Building & Improvements 1,683,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StarkeMember
   
Costs Capitalized Subsequent to Acquisition 4,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StarkeMember
   
Total Cost      
Land 71,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StarkeMember
   
Building & Improvements 1,686,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StarkeMember
   
Total 1,757,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StarkeMember
   
Accumulated Depreciation 599,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StarkeMember
   
Total Cost, Net of Accumulated Depreciation 1,158,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StarkeMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StarkeMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 1,757,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StarkeMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 599,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StarkeMember
   
State Street Crossing [Member]      
Initial Cost      
Land 1,283,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StateStreetCrossingMember
   
Building & Improvements 1,970,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StateStreetCrossingMember
   
Costs Capitalized Subsequent to Acquisition 107,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StateStreetCrossingMember
   
Total Cost      
Land 1,283,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StateStreetCrossingMember
   
Building & Improvements 2,077,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StateStreetCrossingMember
   
Total 3,360,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StateStreetCrossingMember
   
Accumulated Depreciation 473,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StateStreetCrossingMember
   
Total Cost, Net of Accumulated Depreciation 2,887,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StateStreetCrossingMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StateStreetCrossingMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 3,360,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StateStreetCrossingMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 473,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StateStreetCrossingMember
   
Sterling Ridge [Member]      
Initial Cost      
Land 12,846,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SterlingRidgeMember
   
Building & Improvements 12,162,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SterlingRidgeMember
   
Costs Capitalized Subsequent to Acquisition 490,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SterlingRidgeMember
   
Total Cost      
Land 12,846,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SterlingRidgeMember
   
Building & Improvements 12,652,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SterlingRidgeMember
   
Total 25,498,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SterlingRidgeMember
   
Accumulated Depreciation 7,431,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SterlingRidgeMember
   
Total Cost, Net of Accumulated Depreciation 18,067,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SterlingRidgeMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 13,900,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SterlingRidgeMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 25,498,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SterlingRidgeMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 7,431,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SterlingRidgeMember
   
Stonewall [Member]      
Initial Cost      
Land 27,511,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StonewallMember
   
Building & Improvements 22,123,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StonewallMember
   
Costs Capitalized Subsequent to Acquisition 6,886,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StonewallMember
   
Total Cost      
Land 28,429,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StonewallMember
   
Building & Improvements 28,091,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StonewallMember
   
Total 56,520,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StonewallMember
   
Accumulated Depreciation 10,146,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StonewallMember
   
Total Cost, Net of Accumulated Depreciation 46,374,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StonewallMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StonewallMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 56,520,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StonewallMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 10,146,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StonewallMember
   
Strawflower Village [Member]      
Initial Cost      
Land 4,060,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StrawflowerVillageMember
   
Building & Improvements 8,084,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StrawflowerVillageMember
   
Costs Capitalized Subsequent to Acquisition 394,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StrawflowerVillageMember
   
Total Cost      
Land 4,060,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StrawflowerVillageMember
   
Building & Improvements 8,478,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StrawflowerVillageMember
   
Total 12,538,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StrawflowerVillageMember
   
Accumulated Depreciation 3,767,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StrawflowerVillageMember
   
Total Cost, Net of Accumulated Depreciation 8,771,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StrawflowerVillageMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StrawflowerVillageMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 12,538,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StrawflowerVillageMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 3,767,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StrawflowerVillageMember
   
Stroh Ranch [Member]      
Initial Cost      
Land 4,280,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StrohRanchMember
   
Building & Improvements 8,189,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StrohRanchMember
   
Costs Capitalized Subsequent to Acquisition 503,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StrohRanchMember
   
Total Cost      
Land 4,280,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StrohRanchMember
   
Building & Improvements 8,692,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StrohRanchMember
   
Total 12,972,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StrohRanchMember
   
Accumulated Depreciation 5,246,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StrohRanchMember
   
Total Cost, Net of Accumulated Depreciation 7,726,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StrohRanchMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StrohRanchMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 12,972,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StrohRanchMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 5,246,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_StrohRanchMember
   
Suncoast Crossing [Member]      
Initial Cost      
Land 4,057,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SuncoastCrossingMember
   
Building & Improvements 5,545,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SuncoastCrossingMember
   
Costs Capitalized Subsequent to Acquisition 10,253,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SuncoastCrossingMember
   
Total Cost      
Land 9,030,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SuncoastCrossingMember
   
Building & Improvements 10,825,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SuncoastCrossingMember
   
Total 19,855,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SuncoastCrossingMember
   
Accumulated Depreciation 3,575,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SuncoastCrossingMember
   
Total Cost, Net of Accumulated Depreciation 16,280,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SuncoastCrossingMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SuncoastCrossingMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 19,855,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SuncoastCrossingMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 3,575,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SuncoastCrossingMember
   
Tanasbourne Market [Member]      
Initial Cost      
Land 3,269,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TanasbourneMarketMember
   
Building & Improvements 10,861,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TanasbourneMarketMember
   
Costs Capitalized Subsequent to Acquisition (296,000)us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TanasbourneMarketMember
   
Total Cost      
Land 3,269,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TanasbourneMarketMember
   
Building & Improvements 10,565,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TanasbourneMarketMember
   
Total 13,834,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TanasbourneMarketMember
   
Accumulated Depreciation 3,142,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TanasbourneMarketMember
   
Total Cost, Net of Accumulated Depreciation 10,692,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TanasbourneMarketMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TanasbourneMarketMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 13,834,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TanasbourneMarketMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 3,142,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TanasbourneMarketMember
   
Tassajara Crossing [Member]      
Initial Cost      
Land 8,560,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TassajaraCrossingMember
   
Building & Improvements 15,464,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TassajaraCrossingMember
   
Costs Capitalized Subsequent to Acquisition 781,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TassajaraCrossingMember
   
Total Cost      
Land 8,560,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TassajaraCrossingMember
   
Building & Improvements 16,245,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TassajaraCrossingMember
   
Total 24,805,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TassajaraCrossingMember
   
Accumulated Depreciation 6,747,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TassajaraCrossingMember
   
Total Cost, Net of Accumulated Depreciation 18,058,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TassajaraCrossingMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 19,800,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TassajaraCrossingMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 24,805,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TassajaraCrossingMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 6,747,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TassajaraCrossingMember
   
Tech Ridge [Member]      
Initial Cost      
Land 12,945,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TechRidgeMember
   
Building & Improvements 37,169,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TechRidgeMember
   
Costs Capitalized Subsequent to Acquisition 375,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TechRidgeMember
   
Total Cost      
Land 12,945,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TechRidgeMember
   
Building & Improvements 37,544,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TechRidgeMember
   
Total 50,489,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TechRidgeMember
   
Accumulated Depreciation 5,244,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TechRidgeMember
   
Total Cost, Net of Accumulated Depreciation 45,245,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TechRidgeMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 9,644,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TechRidgeMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 50,489,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TechRidgeMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 5,244,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TechRidgeMember
   
The Hub Hillcrest Market [Member]      
Initial Cost      
Land 18,773,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TheHubHillcrestMarketMember
   
Building & Improvements 61,906,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TheHubHillcrestMarketMember
   
Costs Capitalized Subsequent to Acquisition 2,789,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TheHubHillcrestMarketMember
   
Total Cost      
Land 19,355,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TheHubHillcrestMarketMember
   
Building & Improvements 64,114,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TheHubHillcrestMarketMember
   
Total 83,469,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TheHubHillcrestMarketMember
   
Accumulated Depreciation 3,744,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TheHubHillcrestMarketMember
   
Total Cost, Net of Accumulated Depreciation 79,725,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TheHubHillcrestMarketMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TheHubHillcrestMarketMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 83,469,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TheHubHillcrestMarketMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 3,744,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TheHubHillcrestMarketMember
   
Town Square [Member]      
Initial Cost      
Land 883,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TownSquareMember
   
Building & Improvements 8,132,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TownSquareMember
   
Costs Capitalized Subsequent to Acquisition 356,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TownSquareMember
   
Total Cost      
Land 883,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TownSquareMember
   
Building & Improvements 8,488,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TownSquareMember
   
Total 9,371,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TownSquareMember
   
Accumulated Depreciation 4,050,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TownSquareMember
   
Total Cost, Net of Accumulated Depreciation 5,321,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TownSquareMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TownSquareMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 9,371,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TownSquareMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 4,050,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TownSquareMember
   
Twin City Plaza [Member]      
Initial Cost      
Land 17,245,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TwinCityPlazaMember
   
Building & Improvements 44,225,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TwinCityPlazaMember
   
Costs Capitalized Subsequent to Acquisition 1,379,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TwinCityPlazaMember
   
Total Cost      
Land 17,263,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TwinCityPlazaMember
   
Building & Improvements 45,586,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TwinCityPlazaMember
   
Total 62,849,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TwinCityPlazaMember
   
Accumulated Depreciation 11,606,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TwinCityPlazaMember
   
Total Cost, Net of Accumulated Depreciation 51,243,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TwinCityPlazaMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 39,745,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TwinCityPlazaMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 62,849,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TwinCityPlazaMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 11,606,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TwinCityPlazaMember
   
Twin Peaks [Member]      
Initial Cost      
Land 5,200,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TwinPeaksMember
   
Building & Improvements 25,827,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TwinPeaksMember
   
Costs Capitalized Subsequent to Acquisition 695,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TwinPeaksMember
   
Total Cost      
Land 5,200,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TwinPeaksMember
   
Building & Improvements 26,522,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TwinPeaksMember
   
Total 31,722,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TwinPeaksMember
   
Accumulated Depreciation 10,823,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TwinPeaksMember
   
Total Cost, Net of Accumulated Depreciation 20,899,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TwinPeaksMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TwinPeaksMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 31,722,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TwinPeaksMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 10,823,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_TwinPeaksMember
   
Valencia Crossroads [Member]      
Initial Cost      
Land 17,921,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ValenciaCrossroadsMember
   
Building & Improvements 17,659,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ValenciaCrossroadsMember
   
Costs Capitalized Subsequent to Acquisition 559,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ValenciaCrossroadsMember
   
Total Cost      
Land 17,921,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ValenciaCrossroadsMember
   
Building & Improvements 18,219,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ValenciaCrossroadsMember
   
Total 36,140,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ValenciaCrossroadsMember
   
Accumulated Depreciation 12,972,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ValenciaCrossroadsMember
   
Total Cost, Net of Accumulated Depreciation 23,168,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ValenciaCrossroadsMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ValenciaCrossroadsMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 36,140,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ValenciaCrossroadsMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 12,972,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_ValenciaCrossroadsMember
   
Village at Lee Airpark [Member]      
Initial Cost      
Land 11,099,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_VillageAtLeeAirparkMember
   
Building & Improvements 12,955,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_VillageAtLeeAirparkMember
   
Costs Capitalized Subsequent to Acquisition 2,292,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_VillageAtLeeAirparkMember
   
Total Cost      
Land 11,352,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_VillageAtLeeAirparkMember
   
Building & Improvements 15,320,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_VillageAtLeeAirparkMember
   
Total 26,672,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_VillageAtLeeAirparkMember
   
Accumulated Depreciation 4,126,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_VillageAtLeeAirparkMember
   
Total Cost, Net of Accumulated Depreciation 22,546,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_VillageAtLeeAirparkMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_VillageAtLeeAirparkMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 26,672,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_VillageAtLeeAirparkMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 4,126,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_VillageAtLeeAirparkMember
   
Village Center [Member]      
Initial Cost      
Land 3,885,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_VillageCenterMember
   
Building & Improvements 14,131,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_VillageCenterMember
   
Costs Capitalized Subsequent to Acquisition 6,847,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_VillageCenterMember
   
Total Cost      
Land 4,829,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_VillageCenterMember
   
Building & Improvements 20,159,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_VillageCenterMember
   
Total 24,988,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_VillageCenterMember
   
Accumulated Depreciation 6,463,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_VillageCenterMember
   
Total Cost, Net of Accumulated Depreciation 18,525,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_VillageCenterMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_VillageCenterMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 24,988,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_VillageCenterMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 6,463,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_VillageCenterMember
   
Walker Center [Member]      
Initial Cost      
Land 3,840,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WalkerCenterMember
   
Building & Improvements 7,232,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WalkerCenterMember
   
Costs Capitalized Subsequent to Acquisition 3,170,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WalkerCenterMember
   
Total Cost      
Land 3,878,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WalkerCenterMember
   
Building & Improvements 10,364,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WalkerCenterMember
   
Total 14,242,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WalkerCenterMember
   
Accumulated Depreciation 4,081,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WalkerCenterMember
   
Total Cost, Net of Accumulated Depreciation 10,161,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WalkerCenterMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WalkerCenterMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 14,242,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WalkerCenterMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 4,081,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WalkerCenterMember
   
Welleby Plaza [Member]      
Initial Cost      
Land 1,496,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WellebyPlazaMember
   
Building & Improvements 7,787,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WellebyPlazaMember
   
Costs Capitalized Subsequent to Acquisition 806,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WellebyPlazaMember
   
Total Cost      
Land 1,496,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WellebyPlazaMember
   
Building & Improvements 8,593,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WellebyPlazaMember
   
Total 10,089,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WellebyPlazaMember
   
Accumulated Depreciation 5,802,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WellebyPlazaMember
   
Total Cost, Net of Accumulated Depreciation 4,287,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WellebyPlazaMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WellebyPlazaMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 10,089,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WellebyPlazaMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 5,802,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WellebyPlazaMember
   
Wellington Town Square [Member]      
Initial Cost      
Land 2,041,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WellingtonTownSquareMember
   
Building & Improvements 12,131,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WellingtonTownSquareMember
   
Costs Capitalized Subsequent to Acquisition 307,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WellingtonTownSquareMember
   
Total Cost      
Land 2,041,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WellingtonTownSquareMember
   
Building & Improvements 12,438,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WellingtonTownSquareMember
   
Total 14,479,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WellingtonTownSquareMember
   
Accumulated Depreciation 5,627,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WellingtonTownSquareMember
   
Total Cost, Net of Accumulated Depreciation 8,852,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WellingtonTownSquareMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 12,800,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WellingtonTownSquareMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 14,479,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WellingtonTownSquareMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 5,627,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WellingtonTownSquareMember
   
West Park Plaza [Member]      
Initial Cost      
Land 5,840,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestParkPlazaMember
   
Building & Improvements 5,759,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestParkPlazaMember
   
Costs Capitalized Subsequent to Acquisition 1,170,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestParkPlazaMember
   
Total Cost      
Land 5,840,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestParkPlazaMember
   
Building & Improvements 6,929,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestParkPlazaMember
   
Total 12,769,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestParkPlazaMember
   
Accumulated Depreciation 2,969,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestParkPlazaMember
   
Total Cost, Net of Accumulated Depreciation 9,800,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestParkPlazaMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestParkPlazaMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 12,769,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestParkPlazaMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 2,969,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestParkPlazaMember
   
Westchase [Member]      
Initial Cost      
Land 5,302,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestchaseMember
   
Building & Improvements 8,273,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestchaseMember
   
Costs Capitalized Subsequent to Acquisition 244,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestchaseMember
   
Total Cost      
Land 5,302,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestchaseMember
   
Building & Improvements 8,517,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestchaseMember
   
Total 13,819,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestchaseMember
   
Accumulated Depreciation 2,294,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestchaseMember
   
Total Cost, Net of Accumulated Depreciation 11,525,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestchaseMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 7,242,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestchaseMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 13,819,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestchaseMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 2,294,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestchaseMember
   
Westchester Plaza [Member]      
Initial Cost      
Land 3,366,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestchesterCommonsMember
   
Building & Improvements 11,751,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestchesterCommonsMember
   
Costs Capitalized Subsequent to Acquisition 9,452,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestchesterCommonsMember
   
Total Cost      
Land 4,655,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestchesterCommonsMember
   
Building & Improvements 20,815,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestchesterCommonsMember
   
Total 25,470,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestchesterCommonsMember
   
Accumulated Depreciation 3,911,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestchesterCommonsMember
   
Total Cost, Net of Accumulated Depreciation 21,559,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestchesterCommonsMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestchesterCommonsMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 25,470,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestchesterCommonsMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 3,911,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestchesterCommonsMember
   
Westchester Plaza [Member]      
Initial Cost      
Land 1,857,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestchesterPlazaMember
   
Building & Improvements 7,572,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestchesterPlazaMember
   
Costs Capitalized Subsequent to Acquisition 269,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestchesterPlazaMember
   
Total Cost      
Land 1,857,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestchesterPlazaMember
   
Building & Improvements 7,841,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestchesterPlazaMember
   
Total 9,698,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestchesterPlazaMember
   
Accumulated Depreciation 4,421,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestchesterPlazaMember
   
Total Cost, Net of Accumulated Depreciation 5,277,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestchesterPlazaMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestchesterPlazaMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 9,698,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestchesterPlazaMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 4,421,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestchesterPlazaMember
   
Westlake Plaza and Center [Member]      
Initial Cost      
Land 7,043,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestlakePlazaAndCenterMember
   
Building & Improvements 27,195,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestlakePlazaAndCenterMember
   
Costs Capitalized Subsequent to Acquisition 1,491,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestlakePlazaAndCenterMember
   
Total Cost      
Land 7,043,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestlakePlazaAndCenterMember
   
Building & Improvements 28,687,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestlakePlazaAndCenterMember
   
Total 35,730,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestlakePlazaAndCenterMember
   
Accumulated Depreciation 12,432,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestlakePlazaAndCenterMember
   
Total Cost, Net of Accumulated Depreciation 23,298,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestlakePlazaAndCenterMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestlakePlazaAndCenterMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 35,730,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestlakePlazaAndCenterMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 12,432,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestlakePlazaAndCenterMember
   
Westwood Village [Member]      
Initial Cost      
Land 19,933,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestwoodVillageMember
   
Building & Improvements 25,301,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestwoodVillageMember
   
Costs Capitalized Subsequent to Acquisition (1,196,000)us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestwoodVillageMember
   
Total Cost      
Land 19,553,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestwoodVillageMember
   
Building & Improvements 24,485,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestwoodVillageMember
   
Total 44,038,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestwoodVillageMember
   
Accumulated Depreciation 8,586,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestwoodVillageMember
   
Total Cost, Net of Accumulated Depreciation 35,452,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestwoodVillageMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestwoodVillageMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 44,038,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestwoodVillageMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 8,586,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WestwoodVillageMember
   
Willow Festival [Member]      
Initial Cost      
Land 1,954,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WillowFestivalMember
   
Building & Improvements 56,501,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WillowFestivalMember
   
Costs Capitalized Subsequent to Acquisition 436,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WillowFestivalMember
   
Total Cost      
Land 1,954,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WillowFestivalMember
   
Building & Improvements 56,937,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WillowFestivalMember
   
Total 58,891,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WillowFestivalMember
   
Accumulated Depreciation 7,373,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WillowFestivalMember
   
Total Cost, Net of Accumulated Depreciation 51,518,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WillowFestivalMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 39,505,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WillowFestivalMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 58,891,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WillowFestivalMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 7,373,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WillowFestivalMember
   
Windmiller Plaza Phase 1 [Member]      
Initial Cost      
Land 2,638,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WindmillerPlazaPhase1Member
   
Building & Improvements 13,241,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WindmillerPlazaPhase1Member
   
Costs Capitalized Subsequent to Acquisition 158,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WindmillerPlazaPhase1Member
   
Total Cost      
Land 2,638,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WindmillerPlazaPhase1Member
   
Building & Improvements 13,399,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WindmillerPlazaPhase1Member
   
Total 16,037,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WindmillerPlazaPhase1Member
   
Accumulated Depreciation 6,161,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WindmillerPlazaPhase1Member
   
Total Cost, Net of Accumulated Depreciation 9,876,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WindmillerPlazaPhase1Member
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WindmillerPlazaPhase1Member
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 16,037,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WindmillerPlazaPhase1Member
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 6,161,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WindmillerPlazaPhase1Member
   
Woodcroft Shopping Center [Member]      
Initial Cost      
Land 1,419,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodcroftShoppingCenterMember
   
Building & Improvements 6,284,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodcroftShoppingCenterMember
   
Costs Capitalized Subsequent to Acquisition 523,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodcroftShoppingCenterMember
   
Total Cost      
Land 1,421,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodcroftShoppingCenterMember
   
Building & Improvements 6,805,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodcroftShoppingCenterMember
   
Total 8,226,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodcroftShoppingCenterMember
   
Accumulated Depreciation 3,463,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodcroftShoppingCenterMember
   
Total Cost, Net of Accumulated Depreciation 4,763,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodcroftShoppingCenterMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodcroftShoppingCenterMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 8,226,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodcroftShoppingCenterMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 3,463,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodcroftShoppingCenterMember
   
Woodman Van Nuys [Member]      
Initial Cost      
Land 5,500,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodmanVanNuysMember
   
Building & Improvements 7,195,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodmanVanNuysMember
   
Costs Capitalized Subsequent to Acquisition 197,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodmanVanNuysMember
   
Total Cost      
Land 5,500,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodmanVanNuysMember
   
Building & Improvements 7,392,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodmanVanNuysMember
   
Total 12,892,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodmanVanNuysMember
   
Accumulated Depreciation 3,127,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodmanVanNuysMember
   
Total Cost, Net of Accumulated Depreciation 9,765,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodmanVanNuysMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodmanVanNuysMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 12,892,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodmanVanNuysMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 3,127,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodmanVanNuysMember
   
Woodmen Plaza [Member]      
Initial Cost      
Land 7,621,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodmenPlazaMember
   
Building & Improvements 11,018,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodmenPlazaMember
   
Costs Capitalized Subsequent to Acquisition 477,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodmenPlazaMember
   
Total Cost      
Land 7,617,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodmenPlazaMember
   
Building & Improvements 11,493,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodmenPlazaMember
   
Total 19,110,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodmenPlazaMember
   
Accumulated Depreciation 9,125,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodmenPlazaMember
   
Total Cost, Net of Accumulated Depreciation 9,985,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodmenPlazaMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodmenPlazaMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 19,110,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodmenPlazaMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 9,125,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodmenPlazaMember
   
Properties in Development [Member]      
Initial Cost      
Land 0us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PropertiesInDevelopmentMember
   
Building & Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PropertiesInDevelopmentMember
   
Costs Capitalized Subsequent to Acquisition 239,538,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PropertiesInDevelopmentMember
   
Total Cost      
Land 24,243,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PropertiesInDevelopmentMember
   
Building & Improvements 215,295,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PropertiesInDevelopmentMember
   
Total 239,538,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PropertiesInDevelopmentMember
   
Accumulated Depreciation 472,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PropertiesInDevelopmentMember
   
Total Cost, Net of Accumulated Depreciation 239,066,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PropertiesInDevelopmentMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PropertiesInDevelopmentMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 239,538,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PropertiesInDevelopmentMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 472,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_PropertiesInDevelopmentMember
   
Russell Ridge [Member]      
Initial Cost      
Land 2,234,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RussellRidgeMember
   
Building & Improvements 6,903,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RussellRidgeMember
   
Costs Capitalized Subsequent to Acquisition 920,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RussellRidgeMember
   
Total Cost      
Land 2,234,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RussellRidgeMember
   
Building & Improvements 7,823,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RussellRidgeMember
   
Total 10,057,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RussellRidgeMember
   
Accumulated Depreciation 3,912,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RussellRidgeMember
   
Total Cost, Net of Accumulated Depreciation 6,145,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RussellRidgeMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RussellRidgeMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 10,057,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RussellRidgeMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 3,912,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_RussellRidgeMember
   
Sammamish-Highlands [Member]      
Initial Cost      
Land 9,300,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SammamishHighlandsMember
   
Building & Improvements 8,075,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SammamishHighlandsMember
   
Costs Capitalized Subsequent to Acquisition 7,777,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SammamishHighlandsMember
   
Total Cost      
Land 9,592,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SammamishHighlandsMember
   
Building & Improvements 15,560,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SammamishHighlandsMember
   
Total 25,152,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SammamishHighlandsMember
   
Accumulated Depreciation 4,412,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SammamishHighlandsMember
   
Total Cost, Net of Accumulated Depreciation 20,740,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SammamishHighlandsMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SammamishHighlandsMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 25,152,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SammamishHighlandsMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 4,412,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_SammamishHighlandsMember
   
Woodside Central [Member]      
Initial Cost      
Land 3,500,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodsideCentralMember
   
Building & Improvements 9,288,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodsideCentralMember
   
Costs Capitalized Subsequent to Acquisition 548,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodsideCentralMember
   
Total Cost      
Land 3,500,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodsideCentralMember
   
Building & Improvements 9,836,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodsideCentralMember
   
Total 13,336,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodsideCentralMember
   
Accumulated Depreciation 4,008,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodsideCentralMember
   
Total Cost, Net of Accumulated Depreciation 9,328,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodsideCentralMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodsideCentralMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 13,336,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodsideCentralMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance 4,008,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_WoodsideCentralMember
   
Corporately Held Assets [Member]      
Initial Cost      
Land 0us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CorporatelyHeldAssetsMember
   
Building & Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CorporatelyHeldAssetsMember
   
Costs Capitalized Subsequent to Acquisition 1,547,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CorporatelyHeldAssetsMember
   
Total Cost      
Land 0us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CorporatelyHeldAssetsMember
   
Building & Improvements 1,547,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CorporatelyHeldAssetsMember
   
Total 1,547,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CorporatelyHeldAssetsMember
   
Accumulated Depreciation 1,085,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CorporatelyHeldAssetsMember
   
Total Cost, Net of Accumulated Depreciation 462,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CorporatelyHeldAssetsMember
   
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CorporatelyHeldAssetsMember
   
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance 1,547,000us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CorporatelyHeldAssetsMember
   
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending balance $ 1,085,000us-gaap_RealEstateAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= reg_CorporatelyHeldAssetsMember
   
Building and Improvements [Member]      
Real Estate and Accumulated Depreciation [Line Items]      
Property, Plant and Equipment, Useful Life 40 years