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, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Numerator:
Net Income Available to Common Stockholders / Unitholders and Participating Securities	$ 54,636	$ 116,991	$ 110,603	$ 153,249
Net Income Allocable to Participating Securities	(53)	(103)	(100)	(134)
Net Income Available to Common Stockholders / Unitholders	$ 54,583	$ 116,888	$ 110,503	$ 153,115
Denominator:
Weighted Average Shares / Units - Basic	132,249	132,051	132,230	131,932
Performance Units (See Note 9) / Performance Units and certain Performance RLP Units (See Note 6)	88	55	88	65
Weighted Average Shares / Units - Diluted	132,337	132,106	132,318	131,997
Earnings Per Share/Unit, Basic [Abstract]
Net Income Available to Common Stockholders / Unitholders - Basic	$ 0.41	$ 0.89	$ 0.84	$ 1.16
Earnings Per Share/Unit, Diluted [Abstract]
Net Income Available to Common Stockholders / Unitholders - Diluted	$ 0.41	$ 0.88	$ 0.84	$ 1.16
First Industrial, L.P.
Numerator:
Net Income Available to Common Stockholders / Unitholders and Participating Securities	$ 56,023	$ 119,419	$ 113,417	$ 156,524
Net Income Allocable to Participating Securities	(145)	(269)	(279)	(357)
Net Income Available to Common Stockholders / Unitholders	$ 55,878	$ 119,150	$ 113,138	$ 156,167
Denominator:
Weighted Average Shares / Units - Basic	134,702	134,278	134,694	134,176
Performance Units (See Note 9) / Performance Units and certain Performance RLP Units (See Note 6)	545	312	545	367
Weighted Average Shares / Units - Diluted	135,247	134,590	135,239	134,543
Earnings Per Share/Unit, Basic [Abstract]
Net Income Available to Common Stockholders / Unitholders - Basic	$ 0.41	$ 0.89	$ 0.84	$ 1.16
Earnings Per Share/Unit, Diluted [Abstract]
Net Income Available to Common Stockholders / Unitholders - Diluted	$ 0.41	$ 0.89	$ 0.84	$ 1.16