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Derivative Financial Instruments - Additional Information (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Derivative [Line Items]  
Current Fiscal Year End Date --12-31
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months $ 8,700,000us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths
Assets [Member]  
Derivative [Line Items]  
Derivative, Notional Amount $ 220,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_AssetsMember
2015 Debt Issuance [Member] | Derivative [Member]  
Derivative [Line Items]  
Derivative, weighted average fixed interest rate 2.67%reg_Derivativeweightedaveragefixedinterestrate
/ us-gaap_DerivativeByNatureAxis
= us-gaap_DerivativeMember
/ us-gaap_DerivativeInstrumentRiskAxis
= reg_A2015DebtIssuanceMember
2017 Debt issuance [Member] | Derivative [Member]  
Derivative [Line Items]  
Derivative, weighted average fixed interest rate 3.48%reg_Derivativeweightedaveragefixedinterestrate
/ us-gaap_DerivativeByNatureAxis
= us-gaap_DerivativeMember
/ us-gaap_DerivativeInstrumentRiskAxis
= reg_A2017DebtissuanceMember