Consolidated Statements of Capital - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Increase (Decrease) in Partners' Capital [Roll Forward]
Net Income, excluding amounts attributable to redeemable noncontrolling Interests	$ 61,719	$ 57,575	$ 230,953	$ 175,091
Other comprehensive (loss) income - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	(4,870)	1,277	(1,880)	1,016
Contributions from noncontrolling interests		165	725	1,092
Accumulated Other Comprehensive Income (Loss)
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	(4,870)	1,277	(1,880)	1,016
Federal Realty OP LP
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	3,070,813	2,980,431	3,042,159	3,034,015
Net Income, excluding amounts attributable to redeemable noncontrolling Interests	61,719	57,575	230,953	175,091
Other comprehensive (loss) income - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	(4,870)	1,277	(1,880)	1,016
Distributions declared to common unit holders	(93,442)	(88,958)	(275,006)	(265,022)
Distributions on preferred units	(2,008)	(2,008)	(6,024)	(6,024)
Distributions declared to noncontrolling interests in consolidated partnerships, excluding amounts attributable to redeemable noncontrolling interests	(1,293)	(1,081)	(3,183)	(3,283)
Common units issued as a result of common stock issued by Parent Company, net of issuance costs	151,389	9,703	222,319	15,895
Common units issued under dividend reinvestment plan	476	475	1,323	1,380
Share-based compensation expense, net of forfeitures	3,777	3,738	11,952	11,868
Common units withheld for employee taxes	(286)	(268)	(4,972)	(4,979)
Purchase of noncontrolling interest			(12,358)
Contributions from noncontrolling interests		165	725	1,092
Purchase of capped calls			(19,448)
Ending balance	3,185,600	2,961,049	3,185,600	2,961,049
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	6,024	6,024
Distributions on preferred units	(2,008)	(2,008)	(6,024)	(6,024)
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	2,833,788	2,740,405	2,804,669	2,793,467
Net Income, excluding amounts attributable to redeemable noncontrolling Interests	58,945	55,040	223,647	166,858
Distributions declared to common unit holders	(93,442)	(88,958)	(275,006)	(265,022)
Common units issued as a result of common stock issued by Parent Company, net of issuance costs	151,389	9,703	222,319	15,895
Common units issued under dividend reinvestment plan	476	475	1,323	1,380
Share-based compensation expense, net of forfeitures	3,777	3,738	11,952	11,868
Common units withheld for employee taxes	(286)	(268)	(4,972)	(4,979)
Purchase of noncontrolling interest			(10,264)
Purchase of capped calls			(19,448)
Ending balance	2,954,507	2,720,350	2,954,507	2,720,350
Federal Realty OP LP | Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	7,042	5,496	4,052	5,757
Other comprehensive (loss) income - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	(4,870)	1,277	(1,880)	1,016
Ending balance	2,172	6,773	2,172	6,773
Federal Realty OP LP | Total Partner Capital
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	2,995,618	2,900,689	2,963,509	2,954,012
Net Income, excluding amounts attributable to redeemable noncontrolling Interests	60,953	57,048	229,671	172,882
Other comprehensive (loss) income - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	(4,870)	1,277	(1,880)	1,016
Distributions declared to common unit holders	(93,442)	(88,958)	(275,006)	(265,022)
Distributions on preferred units	(2,008)	(2,008)	(6,024)	(6,024)
Common units issued as a result of common stock issued by Parent Company, net of issuance costs	151,389	9,703	222,319	15,895
Common units issued under dividend reinvestment plan	476	475	1,323	1,380
Share-based compensation expense, net of forfeitures	3,777	3,738	11,952	11,868
Common units withheld for employee taxes	(286)	(268)	(4,972)	(4,979)
Purchase of noncontrolling interest			(10,264)
Purchase of capped calls			(19,448)
Ending balance	3,111,467	2,881,911	3,111,467	2,881,911
Federal Realty OP LP | Noncontrolling Interests in Consolidated Partnerships
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	75,195	79,742	78,650	80,003
Net Income, excluding amounts attributable to redeemable noncontrolling Interests	766	527	1,282	2,209
Distributions declared to noncontrolling interests in consolidated partnerships, excluding amounts attributable to redeemable noncontrolling interests	(1,293)	(1,081)	(3,183)	(3,283)
Purchase of noncontrolling interest			(2,094)
Contributions from noncontrolling interests		165	725	1,092
Ending balance	74,133	79,138	74,133	79,138
Federal Realty OP LP | downREIT OP units
Increase (Decrease) in Partners' Capital [Roll Forward]
Conversion and redemption of downREIT OP units	(675)	0	(960)	0
Federal Realty OP LP | downREIT OP units | Common Units
Increase (Decrease) in Partners' Capital [Roll Forward]
Conversion and redemption of downREIT OP units	(140)	215	287	883
Federal Realty OP LP | downREIT OP units | Total Partner Capital
Increase (Decrease) in Partners' Capital [Roll Forward]
Conversion and redemption of downREIT OP units	(140)	215	287	883
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	$ (535)	$ (215)	$ (1,247)	$ (883)