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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Operating real estate, consolidated variable interest entities $ 1,898,790 $ 1,832,190
Construction-in-progress, consolidated variable interest entities 30,376 28,418
Accumulated depreciation and amortization, consolidated variable interest entities 474,534 468,725
Mortgages payable, consolidated variable interest entities $ 191,475 $ 194,176
Preferred shares, authorized 15,000,000 15,000,000
Preferred shares, par value $ 0.01 $ 0.01
Common shares of beneficial interest, par value $ 0.01 $ 0.01
Common shares of beneficial interest, shares authorized 200,000,000 200,000,000
Common shares of beneficial interest, shares issued 86,386,687 86,266,009
Common shares of beneficial interest, shares outstanding 86,386,687 86,266,009
Federal Realty OP LP    
Operating real estate, consolidated variable interest entities $ 1,898,790 $ 1,832,190
Construction-in-progress, consolidated variable interest entities 30,376 28,418
Accumulated depreciation and amortization, consolidated variable interest entities 474,534 468,725
Mortgages payable, consolidated variable interest entities $ 191,475 $ 194,176
Preferred units, issued 398,878 398,878
Preferred units, outstanding 398,878 398,878
Common units, issued 86,386,687 86,266,009
Common units, outstanding 86,386,687 86,266,009
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%
Preferred shares, liquidation preference per share $ 25 $ 25
Preferred shares, shares issued 392,878 392,878
Preferred shares, shares outstanding 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
Preferred shares, shares issued 6,000 6,000
Preferred shares, shares outstanding 6,000 6,000