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Summary of Significant Accounting Policies - Additional Information (Details) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended
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Aug. 18, 2023 $ / shares | May 17, 2023 | Dec. 31, 2023 USD ($) ft² TenantAccount RetailShoppingCenter ShoppingCenter $ / shares shares | Dec. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2021 USD ($)
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Unsecured public and private notes |  |  | $ 200,000 |  |
Conversion of Stock, Description |  |  | The combined company continues to trade under the ticker symbol “REG” on the National Association of Securities Dealers Automated Quotations (the “NASDAQ”). The closing of the mergers completed on August 18, 2023 and each share of Urstadt Biddle’s common stock, par value $0.01 per share (“Urstadt Biddle common stock”), class A common stock, par value $0.01 per share (“Urstadt Biddle Class A common stock” and, together with Urstadt Biddle common stock, the “Urstadt Biddle common shares”), 6.25% Series H Cumulative Redeemable Preferred Stock and 5.875% Series K Cumulative Redeemable Preferred Stock converted into one equivalent share in UB Sub I, with respect to each class, subject to limited exceptions set forth in the merger agreement. Immediately thereafter, on August 18, 2023, each share of UB Sub I’s common stock, par value $0.01 per share, and class A common stock, par value $0.01 per share, converted into 0.347 of a share of common stock, par value $0.01 per share, of common stock of the Parent Company, without interest and subject to certain adjustments, subject to limited exceptions set forth in the merger agreement, and each share of UB Sub I’s 6.25% Series H Cumulative Redeemable Preferred Stock and 5.875% Series K Cumulative Redeemable Preferred Stock was converted into one share of newly issued Parent Company 6.25% Series A Cumulative Redeemable Preferred Stock (“Parent Company Series A preferred stock”) and 5.875% Series B Cumulative Redeemable Preferred Stock (“Parent Company Series B preferred stock”), respectively (collectively referred to as the “Preferred Stock”). |  |
Common stock, par value per share | $ / shares |  |  | $ 0.01 | $ 0.01 |
General partners' capital account, units outstanding | shares |  |  | 184,581,000 | 171,125,000 |
Partners' capital account, units | shares |  |  | 185,688,524 | 171,866,000 |
Tenant and other receivables |  |  | $ 206,162 | $ 188,863 |
Pre-development costs |  |  | 100 | 600 | $ 1,500
Restricted cash and cash equivalent |  |  | $ 6,383 | 2,310 |
Cash and cash equivalents and restricted original maturity |  |  | 90 days or less |  |
Percentage of pro-rata annual base rent |  |  | 20.00% |  |
Number of tenant | TenantAccount |  |  | 0 |  |
Number of shopping center | ShoppingCenter |  |  | 0 |  |
Management, transaction, and other fee [Member] |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Tenant and other receivables |  |  | $ 18,500 | 16,400 |
Parent Company [Member] |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Restricted cash and cash equivalent |  |  | $ 6,400 | 2,300 |
Leases less than 10,000 sqft [Member] |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Operating leases, tenant space terms | ft² |  |  | 10,000 |  |
Leases greater then 10,000 sqft [Member] |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Operating leases, tenant space terms | ft² |  |  | 10,000 |  |
Minimum [Member] |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Expected useful lives of the properties and other intangible assets |  |  | 10 years |  |
Operating leases, lease year range |  |  | 3 years |  |
Operating leases, lease year range for tenant space greater than 10,000 sq ft |  |  | 5 years |  |
Maximum [Member] |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Expected useful lives of the properties and other intangible assets |  |  | 40 years |  |
Operating leases, lease year range |  |  | 7 years |  |
Maximum [Member] | Revenue [Member] | Customer Concentration Risk [Member] |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  | 10.00% |  |
Merger Agreement [Member] |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Merger agreement date |  | May 17, 2023 |  |  |
Merger One [Member] | Common Stock [Member] |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Stock conversion ratio |  |  | 1 |  |
Merger One [Member] | Urstadt Biddle Common Stock [Member] |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Common stock, par value per share | $ / shares |  |  | $ 0.01 |  |
Merger One [Member] | Urstadt Biddle Class A common Stock [Member] |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Common stock, par value per share | $ / shares |  |  | $ 0.01 |  |
Merger One [Member] | 6.25% Series H Cumulative Redeemable Preferred Stock [Member] |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Debt instrument interest rate stated percentage |  |  | 6.25% |  |
Merger One [Member] | 5.875% Series K Cumulative Redeemable Preferred Stock [Member] |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Debt instrument interest rate stated percentage |  |  | 5.875% |  |
Merger Two [Member] | Common Stock [Member] |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Stock conversion ratio | 0.347 |  |  |  |
Merger Two [Member] | Urstadt Biddle Class A common Stock [Member] |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Common stock, par value per share | $ / shares | $ 0.01 |  |  |  |
Merger Two [Member] | UB Sub I common Stock [Member] |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Common stock, par value per share | $ / shares | $ 0.01 |  |  |  |
Merger Two [Member] | 6.25% Series H Cumulative Redeemable Preferred Stock [Member] |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Debt instrument interest rate stated percentage | 6.25% |  |  |  |
Merger Two [Member] | 5.875% Series K Cumulative Redeemable Preferred Stock [Member] |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Debt instrument interest rate stated percentage | 5.875% |  |  |  |
Merger Two [Member] | 6.250% Series A Cumulative Redeemable Preferred Stock [Member] |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Debt instrument interest rate stated percentage | 6.25% |  |  |  |
Merger Two [Member] | 5.875% Series B Cumulative Redeemable Preferred Stock [Member] |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Debt instrument interest rate stated percentage | 5.875% |  |  |  |
Merger Two [Member] | Cumulative Redeemable Preferred Stock [Member] |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Stock conversion ratio | 1 |  |  |  |
UBP Acquisition [Member] | Common Stock [Member] |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Common stock, par value per share | $ / shares |  |  | $ 0.01 |  |
Land Improvements [Member] |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Property, plant and equipment, useful life |  |  | 15 years |  |
Building and Improvements [Member] |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Property, plant and equipment, useful life |  |  | 40 years |  |
Refundable deposits - development |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Nonrefundable deposits and other predevelopment costs |  |  | $ 7,700 | 6,900 |
Operating Partnership [Member] |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Ownership percentage of outstanding common partnership units |  |  | 99.40% |  |
General partners' capital account, units outstanding | shares |  |  | 184,581,070 |  |
Parent company, ownership percentage of outstanding common partnership units of operating partnership |  |  | 99.40% |  |
Wholly Owned Properties [Member] |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Number of operating properties | RetailShoppingCenter |  |  | 381 |  |
Unconsolidated Properties [Member] |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Number of operating properties | RetailShoppingCenter |  |  | 101 |  |
Partially Owned Properties [Member] |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Number of operating properties | RetailShoppingCenter |  |  | 119 |  |
Consolidated Properties [Member] |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Number of operating properties | RetailShoppingCenter |  |  | 18 |  |
Development and Redevelopment [Member] |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Interest costs capitalized |  |  | $ 5,700 | 4,200 | 4,200
Maximum period of time in company capitalizes interest costs |  |  | 12 months |  |
Development [Member] |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |
Internal costs for employees directly related to development and redevelopment program |  |  | $ 13,300 | $ 10,800 | $ 11,300

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