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, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Numerator:
Net Income Available to Common Stockholders / Unitholders and Participating Securities	$ 75,012	$ 123,888	$ 185,615	$ 277,137
Net Income Allocable to Participating Securities	(74)	(124)	(174)	(258)
Net Income Available to Common Stockholders / Unitholders	$ 74,938	$ 123,764	$ 185,441	$ 276,879
Denominator:
Weighted Average Shares / Units - Basic	132,264	132,092	132,241	131,986
Performance Units (See Note 9) / Performance Units and certain Performance RLP Units (See Note 6)	75	84	84	71
Weighted Average Shares / Units - Diluted	132,339	132,176	132,325	132,057
Earnings Per Share/Unit, Basic [Abstract]
Net Income Available to Common Stockholders / Unitholders - Basic	$ 0.57	$ 0.94	$ 1.40	$ 2.10
Earnings Per Share/Unit, Diluted [Abstract]
Net Income Available to Common Stockholders / Unitholders - Diluted	$ 0.57	$ 0.94	$ 1.40	$ 2.10
First Industrial, L.P.
Numerator:
Net Income Available to Common Stockholders / Unitholders and Participating Securities	$ 76,917	$ 126,789	$ 190,334	$ 283,313
Net Income Allocable to Participating Securities	(199)	(307)	(478)	(664)
Net Income Available to Common Stockholders / Unitholders	$ 76,718	$ 126,482	$ 189,856	$ 282,649
Denominator:
Weighted Average Shares / Units - Basic	134,704	134,282	134,697	134,212
Performance Units (See Note 9) / Performance Units and certain Performance RLP Units (See Note 6)	462	479	517	404
Weighted Average Shares / Units - Diluted	135,166	134,761	135,214	134,616
Earnings Per Share/Unit, Basic [Abstract]
Net Income Available to Common Stockholders / Unitholders - Basic	$ 0.57	$ 0.94	$ 1.41	$ 2.11
Earnings Per Share/Unit, Diluted [Abstract]
Net Income Available to Common Stockholders / Unitholders - Diluted	$ 0.57	$ 0.94	$ 1.40	$ 2.10