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		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Numerator:
Net Income Available to Common Stockholders / Unitholders	$ 51,277	$ 54,583	$ 119,684	$ 110,503
Denominator:
Weighted Average Shares / Units - Basic	132,368	132,249	132,364	132,230
Performance Units (See Note 9) / Performance Units and certain Performance RLP Units (See Note 6)	31	88	38	88
Weighted Average Shares / Units - Diluted	132,399	132,337	132,402	132,318
Earnings Per Share/Unit, Basic [Abstract]
Net Income Available to Common Stockholders / Unitholders - Basic	$ 0.39	$ 0.41	$ 0.90	$ 0.84
Earnings Per Share/Unit, Diluted [Abstract]
Net Income Available to Common Stockholders / Unitholders - Diluted	$ 0.39	$ 0.41	$ 0.90	$ 0.84
First Industrial, L.P.
Numerator:
Net Income Available to Common Stockholders / Unitholders	$ 52,597	$ 55,878	$ 122,742	$ 113,138
Denominator:
Weighted Average Shares / Units - Basic	135,096	134,702	135,082	134,694
Performance Units (See Note 9) / Performance Units and certain Performance RLP Units (See Note 6)	217	545	268	545
Weighted Average Shares / Units - Diluted	135,313	135,247	135,350	135,239
Earnings Per Share/Unit, Basic [Abstract]
Net Income Available to Common Stockholders / Unitholders - Basic	$ 0.39	$ 0.41	$ 0.91	$ 0.84
Earnings Per Share/Unit, Diluted [Abstract]
Net Income Available to Common Stockholders / Unitholders - Diluted	$ 0.39	$ 0.41	$ 0.91	$ 0.84