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Investments in Real Estate Partnerships - Investment Reconciliation (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]    
Document Fiscal Year Focus 2014  
Capital - Regency $ 442,050us-gaap_EquityMethodInvestmentSummarizedFinancialInformationMinorityInterest $ 468,099us-gaap_EquityMethodInvestmentSummarizedFinancialInformationMinorityInterest
less: Impairment 1,300us-gaap_ImpairmentLossesRelatedToRealEstatePartnerships 5,880us-gaap_ImpairmentLossesRelatedToRealEstatePartnerships
less: Ownership percentage or Restricted Gain Method deferral 29,380us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity 29,261us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity
less: Net book equity in excess of purchase price 78,203reg_EquityMethodSummarizedFinancialInformationNetBookEquityInExcessOfPurchasePrice 78,203reg_EquityMethodSummarizedFinancialInformationNetBookEquityInExcessOfPurchasePrice
Investments in real estate partnerships 333,167us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures 358,849us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
BRE Throne Holdings LLC (BRET) [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage   0.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= reg_BreThroneHoldingsLlcBretMember
Investments in real estate partnerships   0us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= reg_BreThroneHoldingsLlcBretMember
Indian Springs [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_BusinessAcquisitionAxis
= reg_IndianSpringsMember
 
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain $ 18,300us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain
/ us-gaap_BusinessAcquisitionAxis
= reg_IndianSpringsMember