Consolidated Statements of Capital - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Increase (Decrease) in Partners' Capital [Roll Forward]
Net Income, excluding amounts attributable to redeemable noncontrolling Interests	$ 56,063	$ 52,993
Other comprehensive (loss) income - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	(1,211)	3,572
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	(1,211)	3,572
Federal Realty OP LP
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	3,034,015	2,663,148
Net Income, excluding amounts attributable to redeemable noncontrolling Interests	56,063	52,993
Other comprehensive (loss) income - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	(1,211)	3,572
Distributions declared to common unit holders	(88,033)	(84,196)
Distributions declared to preferred unit holders	(2,008)	(2,010)
Distributions declared to noncontrolling interests in consolidated partnerships, excluding amounts attributable to redeemable noncontrolling interests	(1,048)	(1,759)
Common units issued as a result of common stock issued by Parent Company, net of issuance costs	6,251	82,749
Common units issued under dividend reinvestment plan	423	502
Share-based compensation expense, net of forfeitures	4,434	4,179
Common units withheld for employee taxes	(4,645)	(4,601)
Ending balance	3,004,241	2,714,577
Federal Realty OP LP | Preferred Units
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	154,788	154,963
Net Income, excluding amounts attributable to redeemable noncontrolling Interests	2,008	2,010
Distributions declared to preferred unit holders	(2,008)	(2,010)
Ending balance	154,788	154,963
Federal Realty OP LP | Common Units
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	2,793,467	2,427,686
Net Income, excluding amounts attributable to redeemable noncontrolling Interests	53,327	49,974
Distributions declared to common unit holders	(88,033)	(84,196)
Common units issued as a result of common stock issued by Parent Company, net of issuance costs	6,251	82,749
Common units issued under dividend reinvestment plan	423	502
Share-based compensation expense, net of forfeitures	4,434	4,179
Common units withheld for employee taxes	(4,645)	(4,601)
Ending balance	2,765,892	2,477,270
Federal Realty OP LP | Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	5,757	(2,047)
Other comprehensive (loss) income - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	(1,211)	3,572
Ending balance	4,546	1,525
Federal Realty OP LP | Total Partner Capital
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	2,954,012	2,580,602
Net Income, excluding amounts attributable to redeemable noncontrolling Interests	55,335	51,984
Other comprehensive (loss) income - change in fair value of interest rate swaps, excluding portion attributable to redeemable noncontrolling interests	(1,211)	3,572
Distributions declared to common unit holders	(88,033)	(84,196)
Distributions declared to preferred unit holders	(2,008)	(2,010)
Common units issued as a result of common stock issued by Parent Company, net of issuance costs	6,251	82,749
Common units issued under dividend reinvestment plan	423	502
Share-based compensation expense, net of forfeitures	4,434	4,179
Common units withheld for employee taxes	(4,645)	(4,601)
Ending balance	2,925,226	2,633,758
Federal Realty OP LP | Noncontrolling Interests in Consolidated Partnerships
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	80,003	82,546
Net Income, excluding amounts attributable to redeemable noncontrolling Interests	728	1,009
Distributions declared to noncontrolling interests in consolidated partnerships, excluding amounts attributable to redeemable noncontrolling interests	(1,048)	(1,759)
Ending balance	79,015	80,819
Federal Realty OP LP | downREIT OP units
Increase (Decrease) in Partners' Capital [Roll Forward]
Conversion and redemption of downREIT OP units	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	668	977
Federal Realty OP LP | downREIT OP units | Total Partner Capital
Increase (Decrease) in Partners' Capital [Roll Forward]
Conversion and redemption of downREIT OP units	668	977
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	$ (668)	$ (977)