Consolidated Statements of Capital - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Increase (Decrease) in Partners' Capital [Roll Forward]
Net Income (loss), excluding amounts attributable to redeemable noncontrolling Interests	$ 157,943	$ 112,788	$ 222,518	$ 169,234
Other comprehensive (loss) income - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	(684)	(143)	1,828	(2,990)
Purchase of noncontrolling interest	(7,253)	(12,358)	(7,253)	(12,358)
Contributions from noncontrolling interests				725
Purchase of capped calls				(19,448)
Accumulated Other Comprehensive Income
Increase (Decrease) in Partners' Capital [Roll Forward]
Other comprehensive (loss) income - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	(684)	(143)	1,828	(2,990)
Federal Realty OP LP
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	3,264,266	2,995,992	3,244,144	3,042,159
Net Income (loss), excluding amounts attributable to redeemable noncontrolling Interests	157,943	112,788	222,518	169,234
Other comprehensive (loss) income - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	(684)	143	(1,828)	2,990
Distributions declared to common unit holders	(94,933)	(91,085)	(189,808)	(181,564)
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	(1,355)	(1,092)	(2,224)	(1,890)
Common units issued as a result of common stock issued by Parent Company, net of issuance costs	(102)
Common units issued as a result of common stock issued by Parent Company, net of issuance costs		64,553	54,392	70,930
Common units issued under dividend reinvestment plan	463	492	907	847
Share-based compensation expense, net of forfeitures	3,831	3,745	7,943	8,175
Common units withheld for employee taxes	(68)	(72)	(4,675)	(4,686)
Purchase of noncontrolling interest		(12,358)		(12,358)
Contributions from noncontrolling interests				725
Purchase of capped calls				(19,448)
Ending balance	3,320,100	3,070,813	3,320,100	3,070,813
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 (loss), 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	3,033,497	2,756,384	3,012,066	2,804,669
Net Income (loss), excluding amounts attributable to redeemable noncontrolling Interests	153,908	109,974	215,668	164,702
Distributions declared to common unit holders	(94,933)	(91,085)	(189,808)	(181,564)
Common units issued as a result of common stock issued by Parent Company, net of issuance costs	(102)
Common units issued as a result of common stock issued by Parent Company, net of issuance costs		64,553	54,392	70,930
Common units issued under dividend reinvestment plan	463	492	907	847
Share-based compensation expense, net of forfeitures	3,831	3,745	7,943	8,175
Common units withheld for employee taxes	(68)	(72)	(4,675)	(4,686)
Purchase of noncontrolling interest		(10,264)		(10,264)
Purchase of capped calls				(19,448)
Ending balance	3,091,329	2,833,788	3,091,329	2,833,788
Federal Realty OP LP | Accumulated Other Comprehensive Income
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	3,596	6,899	4,740	4,052
Other comprehensive (loss) income - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	(684)	143	(1,828)	2,990
Ending balance	2,912	7,042	2,912	7,042
Federal Realty OP LP | Total Partner Capital
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	3,191,881	2,918,071	3,171,594	2,963,509
Net Income (loss), excluding amounts attributable to redeemable noncontrolling Interests	155,916	111,982	219,684	168,718
Other comprehensive (loss) income - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	(684)	143	(1,828)	2,990
Distributions declared to common unit holders	(94,933)	(91,085)	(189,808)	(181,564)
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	(102)
Common units issued as a result of common stock issued by Parent Company, net of issuance costs		64,553	54,392	70,930
Common units issued under dividend reinvestment plan	463	492	907	847
Share-based compensation expense, net of forfeitures	3,831	3,745	7,943	8,175
Common units withheld for employee taxes	(68)	(72)	(4,675)	(4,686)
Purchase of noncontrolling interest		(10,264)		(10,264)
Purchase of capped calls				(19,448)
Ending balance	3,249,029	2,995,618	3,249,029	2,995,618
Federal Realty OP LP | Noncontrolling Interests in Consolidated Partnerships
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	72,385	77,921	72,550	78,650
Net Income (loss), excluding amounts attributable to redeemable noncontrolling Interests	2,027	806	2,834	516
Distributions declared to noncontrolling interests in consolidated partnerships, excluding amounts attributable to redeemable noncontrolling interests	(1,355)	(1,092)	(2,224)	(1,890)
Purchase of noncontrolling interest		(2,094)		(2,094)
Contributions from noncontrolling interests				725
Ending balance	71,071	75,195	71,071	75,195
Federal Realty OP LP | downREIT OP units
Increase (Decrease) in Partners' Capital [Roll Forward]
Conversion and redemption of downREIT OP units	(7,253)	(285)	(7,253)	(285)
Federal Realty OP LP | downREIT OP units | Common Units
Increase (Decrease) in Partners' Capital [Roll Forward]
Conversion and redemption of downREIT OP units	(5,267)	61	(5,164)	427
Federal Realty OP LP | downREIT OP units | Total Partner Capital
Increase (Decrease) in Partners' Capital [Roll Forward]
Conversion and redemption of downREIT OP units	(5,267)	61	(5,164)	427
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	$ (1,986)	$ (346)	$ (2,089)	$ (712)