Consolidated Statements of Capital - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Increase (Decrease) in Partners' Capital [Roll Forward]
Net Income, excluding amounts attributable to redeemable noncontrolling Interests	$ 61,453	$ 62,675	$ 117,516	$ 115,668
Other comprehensive income (loss) - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	950	2,025	(261)	5,597
Contributions from noncontrolling interests	927		927
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	950	2,025	(261)	5,597
Federal Realty OP LP
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	3,004,241	2,714,577	3,034,015	2,663,148
Net Income, excluding amounts attributable to redeemable noncontrolling Interests	61,453	62,675	117,516	115,668
Other comprehensive income (loss) - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	950	2,025	(261)	5,597
Distributions declared to common unit holders	(88,031)	(84,977)	(176,064)	(169,173)
Distributions declared to preferred unit holders	(2,008)	(2,008)	(4,016)	(4,018)
Distributions declared to noncontrolling interests in consolidated partnerships, excluding amounts attributable to redeemable noncontrolling interests	(1,154)	(866)	(2,202)	(2,625)
Common units issued as a result of common stock issued by Parent Company, net of issuance costs	(59)	176,703	6,192	259,452
Common units issued under dividend reinvestment plan	482	509	905	1,011
Share-based compensation expense, net of forfeitures	3,696	3,500	8,130	7,679
Common units withheld for employee taxes	(66)	(37)	(4,711)	(4,638)
Conversion of preferred units		0		0
Contributions from noncontrolling interests	927		927
Adjustment to redeemable noncontrolling interests		4,326		4,326
Ending balance	2,980,431	2,876,427	2,980,431	2,876,427
Federal Realty OP LP | Preferred Units
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	154,788	154,963	154,788	154,963
Net Income, excluding amounts attributable to redeemable noncontrolling Interests	2,008	2,008	4,016	4,018
Distributions declared to preferred unit holders	(2,008)	(2,008)	(4,016)	(4,018)
Conversion of preferred units		(175)		(175)
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	2,765,892	2,477,270	2,793,467	2,427,686
Net Income, excluding amounts attributable to redeemable noncontrolling Interests	58,491	59,668	111,818	109,642
Distributions declared to common unit holders	(88,031)	(84,977)	(176,064)	(169,173)
Common units issued as a result of common stock issued by Parent Company, net of issuance costs	(59)	176,703	6,192	259,452
Common units issued under dividend reinvestment plan	482	509	905	1,011
Share-based compensation expense, net of forfeitures	3,696	3,500	8,130	7,679
Common units withheld for employee taxes	(66)	(37)	(4,711)	(4,638)
Conversion of preferred units		175		175
Adjustment to redeemable noncontrolling interests		4,326		4,326
Ending balance	2,740,405	2,637,545	2,740,405	2,637,545
Federal Realty OP LP | Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	4,546	1,525	5,757	(2,047)
Other comprehensive income (loss) - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	950	2,025	(261)	5,597
Ending balance	5,496	3,550	5,496	3,550
Federal Realty OP LP | Total Partner Capital
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	2,925,226	2,633,758	2,954,012	2,580,602
Net Income, excluding amounts attributable to redeemable noncontrolling Interests	60,499	61,676	115,834	113,660
Other comprehensive income (loss) - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	950	2,025	(261)	5,597
Distributions declared to common unit holders	(88,031)	(84,977)	(176,064)	(169,173)
Distributions declared to preferred unit holders	(2,008)	(2,008)	(4,016)	(4,018)
Common units issued as a result of common stock issued by Parent Company, net of issuance costs	(59)	176,703	6,192	259,452
Common units issued under dividend reinvestment plan	482	509	905	1,011
Share-based compensation expense, net of forfeitures	3,696	3,500	8,130	7,679
Common units withheld for employee taxes	(66)	(37)	(4,711)	(4,638)
Adjustment to redeemable noncontrolling interests		4,326		4,326
Ending balance	2,900,689	2,795,883	2,900,689	2,795,883
Federal Realty OP LP | Noncontrolling Interests in Consolidated Partnerships
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	79,015	80,819	80,003	82,546
Net Income, excluding amounts attributable to redeemable noncontrolling Interests	954	999	1,682	2,008
Distributions declared to noncontrolling interests in consolidated partnerships, excluding amounts attributable to redeemable noncontrolling interests	(1,154)	(866)	(2,202)	(2,625)
Contributions from noncontrolling interests	927		927
Ending balance	$ 79,742	80,544	79,742	80,544
Federal Realty OP LP | downREIT OP units
Increase (Decrease) in Partners' Capital [Roll Forward]
Conversion and redemption of downREIT OP units		0	0	0
Federal Realty OP LP | downREIT OP units | Common Units
Increase (Decrease) in Partners' Capital [Roll Forward]
Conversion and redemption of downREIT OP units		408	668	1,385
Federal Realty OP LP | downREIT OP units | Total Partner Capital
Increase (Decrease) in Partners' Capital [Roll Forward]
Conversion and redemption of downREIT OP units		408	668	1,385
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		$ (408)	$ (668)	$ (1,385)