Earnings Per Share / Unit (EPS / EPU) - Computation of Basic and Diluted EPS / EPU (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Numerator:
Net Income Available to Common Stockholders / Unitholders	$ 48,067	$ 68,407
Denominator:
Weighted Average Shares / Units - Basic	132,415	132,360
Performance Units (See Note 9) / Performance Units and certain Performance RLP Units (See Note 6)	78	46
Weighted Average Shares / Units - Diluted	132,493	132,406
Earnings Per Share/Unit, Basic [Abstract]
Net Income Available to Common Stockholders / Unitholders - Basic	$ 0.36	$ 0.52
Earnings Per Share/Unit, Diluted [Abstract]
Net Income Available to Common Stockholders / Unitholders - Diluted	$ 0.36	$ 0.52
First Industrial, L.P.
Numerator:
Net Income Available to Common Stockholders / Unitholders	$ 49,462	$ 70,145
Denominator:
Weighted Average Shares / Units - Basic	135,440	135,068
Performance Units (See Note 9) / Performance Units and certain Performance RLP Units (See Note 6)	675	319
Weighted Average Shares / Units - Diluted	136,115	135,387
Earnings Per Share/Unit, Basic [Abstract]
Net Income Available to Common Stockholders / Unitholders - Basic	$ 0.37	$ 0.52
Earnings Per Share/Unit, Diluted [Abstract]
Net Income Available to Common Stockholders / Unitholders - Diluted	$ 0.36	$ 0.52