Consolidated Statements of Capital - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Increase (Decrease) in Partners' Capital [Roll Forward]
Net Income, excluding amounts attributable to redeemable noncontrolling Interests	$ 112,788	$ 61,453	$ 169,234	$ 117,516
Other comprehensive income (loss) - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	143	950	2,990	(261)
Contributions from noncontrolling interests		927	725	927
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Partners' Capital [Roll Forward]
Other comprehensive income (loss) - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	143	950	2,990	(261)
Federal Realty OP LP
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	2,995,992	3,004,241	3,042,159	3,034,015
Net Income, excluding amounts attributable to redeemable noncontrolling Interests	112,788	61,453	169,234	117,516
Other comprehensive income (loss) - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	143	950	2,990	(261)
Distributions declared to common unit holders	(91,085)	(88,031)	(181,564)	(176,064)
Distributions on preferred units	(2,008)	(2,008)	(4,016)	(4,016)
Distributions declared to noncontrolling interests in consolidated partnerships, excluding amounts attributable to redeemable noncontrolling interests	(1,092)	(1,154)	(1,890)	(2,202)
Common units issued as a result of common stock issued by Parent Company, net of issuance costs	64,553	(59)	70,930	6,192
Common units issued under dividend reinvestment plan	492	482	847	905
Share-based compensation expense, net of forfeitures	3,745	3,696	8,175	8,130
Common units withheld for employee taxes	(72)	(66)	(4,686)	(4,711)
Purchase of noncontrolling interest	(12,358)		(12,358)
Contributions from noncontrolling interests		927	725	927
Purchase of capped calls			(19,448)
Ending balance	3,070,813	2,980,431	3,070,813	2,980,431
Federal Realty OP LP | Preferred Units
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	154,788	154,788	154,788	154,788
Net Income, excluding amounts attributable to redeemable noncontrolling Interests	2,008	2,008	4,016	4,016
Distributions on preferred units	(2,008)	(2,008)	(4,016)	(4,016)
Ending balance	154,788	154,788	154,788	154,788
Federal Realty OP LP | Common Units
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	2,756,384	2,765,892	2,804,669	2,793,467
Net Income, excluding amounts attributable to redeemable noncontrolling Interests	109,974	58,491	164,702	111,818
Distributions declared to common unit holders	(91,085)	(88,031)	(181,564)	(176,064)
Common units issued as a result of common stock issued by Parent Company, net of issuance costs	64,553	(59)	70,930	6,192
Common units issued under dividend reinvestment plan	492	482	847	905
Share-based compensation expense, net of forfeitures	3,745	3,696	8,175	8,130
Common units withheld for employee taxes	(72)	(66)	(4,686)	(4,711)
Purchase of noncontrolling interest	(10,264)		(10,264)
Purchase of capped calls			(19,448)
Ending balance	2,833,788	2,740,405	2,833,788	2,740,405
Federal Realty OP LP | Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	6,899	4,546	4,052	5,757
Other comprehensive income (loss) - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	143	950	2,990	(261)
Ending balance	7,042	5,496	7,042	5,496
Federal Realty OP LP | Total Partner Capital
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	2,918,071	2,925,226	2,963,509	2,954,012
Net Income, excluding amounts attributable to redeemable noncontrolling Interests	111,982	60,499	168,718	115,834
Other comprehensive income (loss) - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	143	950	2,990	(261)
Distributions declared to common unit holders	(91,085)	(88,031)	(181,564)	(176,064)
Distributions on preferred units	(2,008)	(2,008)	(4,016)	(4,016)
Common units issued as a result of common stock issued by Parent Company, net of issuance costs	64,553	(59)	70,930	6,192
Common units issued under dividend reinvestment plan	492	482	847	905
Share-based compensation expense, net of forfeitures	3,745	3,696	8,175	8,130
Common units withheld for employee taxes	(72)	(66)	(4,686)	(4,711)
Purchase of noncontrolling interest	(10,264)		(10,264)
Purchase of capped calls			(19,448)
Ending balance	2,995,618	2,900,689	2,995,618	2,900,689
Federal Realty OP LP | Noncontrolling Interests in Consolidated Partnerships
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	77,921	79,015	78,650	80,003
Net Income, excluding amounts attributable to redeemable noncontrolling Interests	806	954	516	1,682
Distributions declared to noncontrolling interests in consolidated partnerships, excluding amounts attributable to redeemable noncontrolling interests	(1,092)	(1,154)	(1,890)	(2,202)
Purchase of noncontrolling interest	(2,094)		(2,094)
Contributions from noncontrolling interests		927	725	927
Ending balance	75,195	$ 79,742	75,195	79,742
Federal Realty OP LP | downREIT OP units
Increase (Decrease) in Partners' Capital [Roll Forward]
Conversion and redemption of downREIT OP units	(285)		(285)	0
Federal Realty OP LP | downREIT OP units | Common Units
Increase (Decrease) in Partners' Capital [Roll Forward]
Conversion and redemption of downREIT OP units	61		427	668
Federal Realty OP LP | downREIT OP units | Total Partner Capital
Increase (Decrease) in Partners' Capital [Roll Forward]
Conversion and redemption of downREIT OP units	61		427	668
Federal Realty OP LP | downREIT OP units | Noncontrolling Interests in Consolidated Partnerships
Increase (Decrease) in Partners' Capital [Roll Forward]
Conversion and redemption of downREIT OP units	$ (346)		$ (712)	$ (668)