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		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Numerator:
Net Income Available to Common Stockholders / Unitholders	$ 99,287	$ 74,938	$ 218,971	$ 185,441
Denominator:
Weighted Average Shares / Units - Basic	132,370	132,264	132,366	132,241
Performance Units (See Note 9) / Performance Units and certain Performance RLP Units (See Note 6)	51	75	43	84
Weighted Average Shares / Units - Diluted	132,421	132,339	132,409	132,325
Earnings Per Share/Unit, Basic [Abstract]
Net Income Available to Common Stockholders / Unitholders - Basic	$ 0.75	$ 0.57	$ 1.65	$ 1.40
Earnings Per Share/Unit, Diluted [Abstract]
Net Income Available to Common Stockholders / Unitholders - Diluted	$ 0.75	$ 0.57	$ 1.65	$ 1.40
First Industrial, L.P.
Numerator:
Net Income Available to Common Stockholders / Unitholders	$ 101,864	$ 76,718	$ 224,606	$ 189,856
Denominator:
Weighted Average Shares / Units - Basic	135,099	134,704	135,088	134,697
Performance Units (See Note 9) / Performance Units and certain Performance RLP Units (See Note 6)	375	462	303	517
Weighted Average Shares / Units - Diluted	135,474	135,166	135,391	135,214
Earnings Per Share/Unit, Basic [Abstract]
Net Income Available to Common Stockholders / Unitholders - Basic	$ 0.75	$ 0.57	$ 1.66	$ 1.41
Earnings Per Share/Unit, Diluted [Abstract]
Net Income Available to Common Stockholders / Unitholders - Diluted	$ 0.75	$ 0.57	$ 1.66	$ 1.40