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v3.21.1

Property Dispositions (Details) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 USD ($) property | Mar. 31, 2020 USD ($) property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Net proceeds from sale of real estate investments | $ | $ 53,859 | $ 103,522
Gain on sale of real estate, net of tax | $ | $ 11,698 | $ 38,005
Operating Properties [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Number of properties sold classified as held for sale | 1 |
Wholly Owned Properties [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Percent interest sold | 100.00% | 100.00%
Operating Properties [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Number of real estate properties sold | 4 | 2
Land [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Number of real estate properties sold | 1 | 1

X
- Definition This element represents the amount of gain (loss) on sale of properties during the reporting period net of the applicable income taxes realized. + References No definition available. + Details
Name: | reg_GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes1
Namespace Prefix: | reg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Net proceed from the sale of real estate that is held for investment. + References No definition available. + Details
Name: | reg_NetProceedsFromSaleOfRealEstateHeldForInvestment
Namespace Prefix: | reg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of properties sold classified as held for sale. + References No definition available. + Details
Name: | reg_NumberOfPropertiesSoldClassifiedAsHeldForSale
Namespace Prefix: | reg_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of Real Estate Properties Sold During the period. + References No definition available. + Details
Name: | reg_NumberOfRealEstatePropertiesSold
Namespace Prefix: | reg_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of limited partnership interest sold. + References No definition available. + Details
Name: | reg_PercentageOfLimitedPartnershipInterestSold
Namespace Prefix: | reg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis=reg_OperatingPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstatePropertiesAxis=us-gaap_WhollyOwnedPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=srt_RetailSiteMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |