Consolidated Statements of Capital - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Increase (Decrease) in Partners' Capital [Roll Forward]
Net Income, excluding amounts attributable to redeemable noncontrolling Interests	$ 159,896	$ 64,575
Other comprehensive (loss) income - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	3,028	(1,144)
Conversion and Redemption of downREIT OP units	(324)
Contributions from noncontrolling interests	265
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	3,028	(1,144)
downREIT OP units
Increase (Decrease) in Partners' Capital [Roll Forward]
Conversion and Redemption of downREIT OP units		0
Federal Realty OP LP
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	3,318,986	3,244,144
Net Income, excluding amounts attributable to redeemable noncontrolling Interests	159,896	64,575
Other comprehensive (loss) income - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	3,028	(1,144)
Distributions declared to common unit holders	(97,626)	(94,875)
Distributions on preferred units	(2,008)	(2,008)
Distributions declared to noncontrolling interests in consolidated partnerships, excluding amounts attributable to redeemable noncontrolling interests	(668)	(869)
Common units issued as a result of common stock issued by Parent Company, net of issuance costs	357	54,494
Common units issued under dividend reinvestment plan		444
Share-based compensation expense, net of forfeitures	4,537	4,112
Common units withheld for employee taxes	(4,926)	(4,607)
Contributions from noncontrolling interests	265
Ending balance	3,381,517	3,264,266
Federal Realty OP LP \| Preferred Units
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	154,788	154,788
Net Income, excluding amounts attributable to redeemable noncontrolling Interests	2,008	2,008
Distributions on preferred units	(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	3,091,896	3,012,066
Net Income, excluding amounts attributable to redeemable noncontrolling Interests	157,091	61,760
Distributions declared to common unit holders	(97,626)	(94,875)
Common units issued as a result of common stock issued by Parent Company, net of issuance costs	357	54,494
Common units issued under dividend reinvestment plan		444
Share-based compensation expense, net of forfeitures	4,537	4,112
Common units withheld for employee taxes	(4,926)	(4,607)
Ending balance	3,151,274	3,033,497
Federal Realty OP LP \| Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	2,047	4,740
Other comprehensive (loss) income - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	3,028	(1,144)
Ending balance	5,075	3,596
Federal Realty OP LP \| Total Partner Capital
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	3,248,731	3,171,594
Net Income, excluding amounts attributable to redeemable noncontrolling Interests	159,099	63,768
Other comprehensive (loss) income - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	3,028	(1,144)
Distributions declared to common unit holders	(97,626)	(94,875)
Distributions on preferred units	(2,008)	(2,008)
Common units issued as a result of common stock issued by Parent Company, net of issuance costs	357	54,494
Common units issued under dividend reinvestment plan		444
Share-based compensation expense, net of forfeitures	4,537	4,112
Common units withheld for employee taxes	(4,926)	(4,607)
Ending balance	3,311,137	3,191,881
Federal Realty OP LP \| Noncontrolling Interests in Consolidated Partnerships
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	70,255	72,550
Net Income, excluding amounts attributable to redeemable noncontrolling Interests	797	807
Distributions declared to noncontrolling interests in consolidated partnerships, excluding amounts attributable to redeemable noncontrolling interests	(668)	(869)
Contributions from noncontrolling interests	265
Ending balance	70,380	72,385
Federal Realty OP LP \| downREIT OP units
Increase (Decrease) in Partners' Capital [Roll Forward]
Conversion and redemption of downREIT OP units	(324)	0
Federal Realty OP LP \| downREIT OP units \| Common Units
Increase (Decrease) in Partners' Capital [Roll Forward]
Conversion and redemption of downREIT OP units	(55)	103
Federal Realty OP LP \| downREIT OP units \| Total Partner Capital
Increase (Decrease) in Partners' Capital [Roll Forward]
Conversion and redemption of downREIT OP units	(55)	103
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	$ (269)	$ (103)

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Other Comprehensive Income (loss), net of portion attributable to noncontrolling interest

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Partners capital account employee tax withholdings

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount after income tax of income (loss) including the portion attributable to nonredeemable noncontrolling interest. Excludes the portion attributable to redeemable noncontrolling interest recognized as temporary equity.

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Total contributions made by each class of partners (i.e., general, limited and preferred partners).

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Total change in each class of partners' capital accounts during the year due to exchanges and conversions. Partners include general, limited and preferred partners.

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Amount of partners' capital (deficit), including portions attributable to both the parent and noncontrolling interests. Excludes temporary equity and is sometimes called permanent equity.

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