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Investments in Real Estate Partnerships - Balance Sheet Summarized Financial Information (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  
Investment in real estate, net $ 2,620,583reg_EquityMethodInvestmentSummarizedFinancialInformationInvestmentInRealEstateNet $ 2,742,591reg_EquityMethodInvestmentSummarizedFinancialInformationInvestmentInRealEstateNet
Acquired lease intangible assets, net 50,763reg_EquityMethodInvestmentSummarizedFinancialInformationAcquiredLeaseIntangibleAssetsNet 52,350reg_EquityMethodInvestmentSummarizedFinancialInformationAcquiredLeaseIntangibleAssetsNet
Other assets 136,156reg_EquityMethodInvestmentSummarizedFinancialInformationOtherAssets 144,658reg_EquityMethodInvestmentSummarizedFinancialInformationOtherAssets
Total assets 2,807,502us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets 2,939,599us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
Notes payable 1,462,790reg_EquityMethodInvestmentSummarizedFinancialInformationNotesPayable 1,519,943reg_EquityMethodInvestmentSummarizedFinancialInformationNotesPayable
Acquired lease intangible liabilities, net 28,991reg_EquityMethodInvestmentSummarizedFinancialInformationAcquiredLeaseIntangibleLiabilitiesNet 31,148reg_EquityMethodInvestmentSummarizedFinancialInformationAcquiredLeaseIntangibleLiabilitiesNet
Other liabilities 67,093reg_EquityMethodInvestmentSummarizedFinancialInformationOtherLiabilities 66,829reg_EquityMethodInvestmentSummarizedFinancialInformationOtherLiabilities
Capital - Regency 442,050us-gaap_EquityMethodInvestmentSummarizedFinancialInformationMinorityInterest 468,099us-gaap_EquityMethodInvestmentSummarizedFinancialInformationMinorityInterest
Capital - Third parties 806,578us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquityOrCapital 853,580us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquityOrCapital
Total liabilities and capital 2,807,502us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesAndEquity 2,939,599us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesAndEquity
Impairment Losses Related to Real Estate Partnerships (1,300)us-gaap_ImpairmentLossesRelatedToRealEstatePartnerships (5,880)us-gaap_ImpairmentLossesRelatedToRealEstatePartnerships
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity (29,380)us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity (29,261)us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity
Equity Method Summarized Financial Information, Net Book Equity in Excess of Purchase Price (78,203)reg_EquityMethodSummarizedFinancialInformationNetBookEquityInExcessOfPurchasePrice (78,203)reg_EquityMethodSummarizedFinancialInformationNetBookEquityInExcessOfPurchasePrice
Investments in real estate partnerships (note 4) 333,167us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures 358,849us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
BRE Throne Holdings LLC (BRET) [Member]    
Schedule of Equity Method Investments [Line Items]    
Total assets   0us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= reg_BreThroneHoldingsLlcBretMember
Investments in real estate partnerships (note 4)   0us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= reg_BreThroneHoldingsLlcBretMember
Indian Springs at Woodlands, Ltd. [Member]    
Schedule of Equity Method Investments [Line Items]    
Investments in real estate partnerships (note 4) $ 0us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= reg_IndianSpringsatWoodlandsLtd.Member
$ 4,094us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= reg_IndianSpringsatWoodlandsLtd.Member