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v3.20.4

Summary of Significant Accounting Policies - Schedule of Collection Rates of Pro-Rata Base Rent Billed by Quarter (Details) | 3 Months Ended
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Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020
Accounting Policies [Abstract] |  |  |
Base Rent Collections | 92.00% | 89.00% | 79.00%

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- Definition Percentage of base rent collected. + References No definition available. + Details
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Namespace Prefix: | reg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration