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Property Dispositions - Schedule of Properties Disposed of (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 USD ($) Property | Sep. 30, 2023 USD ($) Property | Sep. 30, 2024 USD ($) Property | Sep. 30, 2023 USD ($) Property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Net proceeds from sale of real estate investments | $ | $ 11,409 | $ 6,593 | $ 103,568 | $ 9,658
Gain on sale of real estate, net of tax | $ | $ 11,360 | $ 184 | $ 33,844 | $ 515
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% | 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 | Property | 1 |  | 4 |
Land [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Number of real estate properties sold | Property |  | 2 |  | 3

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 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: | dtr-types: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_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: |