Consolidated Statements of Capital - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Increase (Decrease) in Partners' Capital [Roll Forward]
Net Income, excluding amounts attributable to redeemable noncontrolling Interests	$ 157,000	$ 52,946	$ 272,668	$ 148,867
Other comprehensive income - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	2,534	512	8,131	2,918
Deconsolidation of VIE	972		972
Contributions from noncontrolling interests				6,554
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Partners' Capital [Roll Forward]
Other comprehensive income - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	2,534	512	8,131	2,918
Federal Realty OP LP
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	2,876,427	2,575,839	2,663,148	2,548,747
Net Income, excluding amounts attributable to redeemable noncontrolling Interests	157,000	52,946	272,668	148,867
Other comprehensive income - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	2,534	512	8,131	2,918
Distributions declared to common unit holders	(87,694)	(83,212)	(256,867)	(248,000)
Distributions declared to preferred unit holders	(2,008)	(2,010)	(6,026)	(6,031)
Distributions declared to noncontrolling interests in consolidated partnerships, excluding amounts attributable to redeemable noncontrolling interests	(1,441)	(1,555)	(4,066)	(3,282)
Common units issued as a result of common stock issued by Parent Company, net of issuance costs	32,892	(67)	292,344	87,066
Exercise of stock options	35		35
Common units issued under dividend reinvestment plan	573	488	1,584	1,507
Share-based compensation expense, net of forfeitures	3,579	3,367	11,258	10,874
Common units withheld for employee taxes	(248)	(126)	(4,886)	(2,939)
Conversion of preferred units			0
Deconsolidation of VIE	972		972
Adjustment to redeemable noncontrolling interests	(741)		3,585
Contributions from noncontrolling interests				6,554
Ending balance	2,981,880	2,546,182	2,981,880	2,546,182
Federal Realty OP LP | Preferred Units
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	154,788	154,963	154,963	154,963
Net Income, excluding amounts attributable to redeemable noncontrolling Interests	2,008	2,010	6,026	6,031
Distributions declared to preferred unit holders	(2,008)	(2,010)	(6,026)	(6,031)
Conversion of preferred units			(175)
Ending balance	154,788	154,963	154,788	154,963
Federal Realty OP LP | Common Units
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	2,637,545	2,338,364	2,427,686	2,314,838
Net Income, excluding amounts attributable to redeemable noncontrolling Interests	154,130	50,112	263,772	140,531
Distributions declared to common unit holders	(87,694)	(83,212)	(256,867)	(248,000)
Common units issued as a result of common stock issued by Parent Company, net of issuance costs	32,892	(67)	292,344	87,066
Exercise of stock options	35		35
Common units issued under dividend reinvestment plan	573	488	1,584	1,507
Share-based compensation expense, net of forfeitures	3,579	3,367	11,258	10,874
Common units withheld for employee taxes	(248)	(126)	(4,886)	(2,939)
Conversion of preferred units			175
Adjustment to redeemable noncontrolling interests	(741)		3,585
Ending balance	2,740,071	2,308,926	2,740,071	2,308,926
Federal Realty OP LP | Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	3,550	(3,238)	(2,047)	(5,644)
Other comprehensive income - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	2,534	512	8,131	2,918
Ending balance	6,084	(2,726)	6,084	(2,726)
Federal Realty OP LP | Total Partner Capital
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	2,795,883	2,490,089	2,580,602	2,464,157
Net Income, excluding amounts attributable to redeemable noncontrolling Interests	156,138	52,122	269,798	146,562
Other comprehensive income - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	2,534	512	8,131	2,918
Distributions declared to common unit holders	(87,694)	(83,212)	(256,867)	(248,000)
Distributions declared to preferred unit holders	(2,008)	(2,010)	(6,026)	(6,031)
Common units issued as a result of common stock issued by Parent Company, net of issuance costs	32,892	(67)	292,344	87,066
Exercise of stock options	35		35
Common units issued under dividend reinvestment plan	573	488	1,584	1,507
Share-based compensation expense, net of forfeitures	3,579	3,367	11,258	10,874
Common units withheld for employee taxes	(248)	(126)	(4,886)	(2,939)
Adjustment to redeemable noncontrolling interests	(741)		3,585
Ending balance	2,900,943	2,461,163	2,900,943	2,461,163
Federal Realty OP LP | Noncontrolling Interests in Consolidated Partnerships
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	80,544	85,750	82,546	84,590
Net Income, excluding amounts attributable to redeemable noncontrolling Interests	862	824	2,870	2,305
Distributions declared to noncontrolling interests in consolidated partnerships, excluding amounts attributable to redeemable noncontrolling interests	(1,441)	(1,555)	(4,066)	(3,282)
Deconsolidation of VIE	972		972
Contributions from noncontrolling interests				6,554
Ending balance	$ 80,937	$ 85,019	80,937	85,019
Federal Realty OP LP | downREIT OP units
Increase (Decrease) in Partners' Capital [Roll Forward]
Conversion and redemption of downREIT OP units			0	(99)
Federal Realty OP LP | downREIT OP units | Common Units
Increase (Decrease) in Partners' Capital [Roll Forward]
Conversion and redemption of downREIT OP units			1,385	5,049
Federal Realty OP LP | downREIT OP units | Total Partner Capital
Increase (Decrease) in Partners' Capital [Roll Forward]
Conversion and redemption of downREIT OP units			1,385	5,049
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			$ (1,385)	$ (5,148)