Consolidated Statements of Capital - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Increase (Decrease) in Partners' Capital [Roll Forward]
Net Income (loss), excluding amounts attributable to redeemable noncontrolling Interests	$ 56,446	$ 56,063
Other comprehensive income (loss) - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	2,847	(1,211)
Contributions from noncontrolling interests	725
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	2,847	(1,211)
Federal Realty OP LP
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	3,042,159	3,034,015
Net Income (loss), excluding amounts attributable to redeemable noncontrolling Interests	56,446	56,063
Other comprehensive income (loss) - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	2,847	(1,211)
Distributions declared to common unit holders	(90,479)	(88,033)
Distributions declared to preferred unit holders	(2,008)	(2,008)
Distributions declared to noncontrolling interests in consolidated partnerships, excluding amounts attributable to redeemable noncontrolling interests	(798)	(1,048)
Common units issued as a result of common stock issued by Parent Company, net of issuance costs	6,377	6,251
Common units issued under dividend reinvestment plan	355	423
Share-based compensation expense, net of forfeitures	4,430	4,434
Common units withheld for employee taxes	(4,614)	(4,645)
Contributions from noncontrolling interests	725
Purchase of capped calls	(19,448)
Ending balance	2,995,992	3,004,241
Federal Realty OP LP | Preferred Units
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	154,788	154,788
Net Income (loss), excluding amounts attributable to redeemable noncontrolling Interests	2,008	2,008
Distributions declared to preferred unit holders	(2,008)	(2,008)
Ending balance	154,788	154,788
Federal Realty OP LP | Common Units
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	2,804,669	2,793,467
Net Income (loss), excluding amounts attributable to redeemable noncontrolling Interests	54,728	53,327
Distributions declared to common unit holders	(90,479)	(88,033)
Common units issued as a result of common stock issued by Parent Company, net of issuance costs	6,377	6,251
Common units issued under dividend reinvestment plan	355	423
Share-based compensation expense, net of forfeitures	4,430	4,434
Common units withheld for employee taxes	(4,614)	(4,645)
Purchase of capped calls	(19,448)
Ending balance	2,756,384	2,765,892
Federal Realty OP LP | Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	4,052	5,757
Other comprehensive income (loss) - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	2,847	(1,211)
Ending balance	6,899	4,546
Federal Realty OP LP | Total Partner Capital
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	2,963,509	2,954,012
Net Income (loss), excluding amounts attributable to redeemable noncontrolling Interests	56,736	55,335
Other comprehensive income (loss) - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	2,847	(1,211)
Distributions declared to common unit holders	(90,479)	(88,033)
Distributions declared to preferred unit holders	(2,008)	(2,008)
Common units issued as a result of common stock issued by Parent Company, net of issuance costs	6,377	6,251
Common units issued under dividend reinvestment plan	355	423
Share-based compensation expense, net of forfeitures	4,430	4,434
Common units withheld for employee taxes	(4,614)	(4,645)
Purchase of capped calls	(19,448)
Ending balance	2,918,071	2,925,226
Federal Realty OP LP | Noncontrolling Interests in Consolidated Partnerships
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	78,650	80,003
Net Income (loss), excluding amounts attributable to redeemable noncontrolling Interests	(290)	728
Distributions declared to noncontrolling interests in consolidated partnerships, excluding amounts attributable to redeemable noncontrolling interests	(798)	(1,048)
Contributions from noncontrolling interests	725
Ending balance	77,921	79,015
Federal Realty OP LP | downREIT OP units
Increase (Decrease) in Partners' Capital [Roll Forward]
Conversion of downREIT OP units	0	0
Federal Realty OP LP | downREIT OP units | Common Units
Increase (Decrease) in Partners' Capital [Roll Forward]
Conversion of downREIT OP units	366	668
Federal Realty OP LP | downREIT OP units | Total Partner Capital
Increase (Decrease) in Partners' Capital [Roll Forward]
Conversion of downREIT OP units	366	668
Federal Realty OP LP | downREIT OP units | Noncontrolling Interests in Consolidated Partnerships
Increase (Decrease) in Partners' Capital [Roll Forward]
Conversion of downREIT OP units	$ (366)	$ (668)