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, 2024	Mar. 31, 2023
Numerator:
Net Income Available to Common Stockholders / Unitholders	$ 68,407	$ 55,920
Denominator:
Weighted Average Shares / Units - Basic	132,360	132,211
Performance Units (See Note 9) / Performance Units and certain Performance RLP Units (See Note 6)	46	88
Weighted Average Shares / Units - Diluted	132,406	132,299
Earnings Per Share/Unit, Basic [Abstract]
Net Income Available to Common Stockholders / Unitholders - Basic	$ 0.52	$ 0.42
Earnings Per Share/Unit, Diluted [Abstract]
Net Income Available to Common Stockholders / Unitholders - Diluted	$ 0.52	$ 0.42
First Industrial, L.P.
Numerator:
Net Income Available to Common Stockholders / Unitholders	$ 70,145	$ 57,260
Denominator:
Weighted Average Shares / Units - Basic	135,068	134,686
Performance Units (See Note 9) / Performance Units and certain Performance RLP Units (See Note 6)	319	545
Weighted Average Shares / Units - Diluted	135,387	135,231
Earnings Per Share/Unit, Basic [Abstract]
Net Income Available to Common Stockholders / Unitholders - Basic	$ 0.52	$ 0.43
Earnings Per Share/Unit, Diluted [Abstract]
Net Income Available to Common Stockholders / Unitholders - Diluted	$ 0.52	$ 0.42