Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2024	Dec. 31, 2023
Operating real estate, consolidated variable interest entities	$ 1,822,143	$ 1,822,143	$ 2,021,622
Construction-in-progress, consolidated variable interest entities	8,352	8,352	8,677
Accumulated depreciation and amortization, consolidated variable interest entities	414,128	414,128	416,663
Mortgages payable, consolidated variable interest entities	$ 187,311	$ 187,311	$ 189,286
Preferred shares, authorized	15,000,000	15,000,000	15,000,000
Preferred shares, par value	$ 0.01	$ 0.01	$ 0.01
Common shares of beneficial interest, par value	$ 0.01	$ 0.01	$ 0.01
Common shares of beneficial interest, shares authorized	200,000,000	200,000,000	200,000,000
Common shares of beneficial interest, shares issued	84,952,538	84,952,538	82,775,286
Common shares of beneficial interest, shares outstanding	84,952,538	84,952,538	82,775,286
Federal Realty OP LP
Operating real estate, consolidated variable interest entities	$ 1,822,143	$ 1,822,143	$ 2,021,622
Construction-in-progress, consolidated variable interest entities	8,352	8,352	8,677
Accumulated depreciation and amortization, consolidated variable interest entities	414,128	414,128	416,663
Mortgages payable, consolidated variable interest entities	$ 187,311	$ 187,311	$ 189,286
Preferred units, issued	398,878	398,878	398,878
Preferred units, outstanding	398,878	398,878	398,878
Common units, issued	84,952,538	84,952,538	82,775,286
Common units, outstanding	84,952,538	84,952,538	82,775,286
5.417% Series 1 Cumulative Convertible Preferred Shares, (stated at liquidation preference $25 per share), 392,878 shares issued and outstanding
Preferred shares, percentage	5.417%	5.417%	5.417%
Preferred shares, liquidation preference per share	$ 25	$ 25	$ 25
Preferred shares, shares issued	392,878	392,878	392,878
Preferred shares, shares outstanding	392,878	392,878	392,878
5.0% Series C Cumulative Redeemable Preferred Shares, (stated at liquidation preference $25,000 per share), 6,000 shares issued and outstanding
Preferred shares, percentage		5.00%	5.00%
Preferred shares, liquidation preference per share	$ 25,000	$ 25,000	$ 25,000
Preferred shares, shares issued	6,000	6,000	6,000
Preferred shares, shares outstanding	6,000	6,000	6,000