Summary of Significant Accounting Policies - Additional Information (Details) $ / shares in Units, $ in Thousands			12 Months Ended
	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