Earnings Per Share / Unit (EPS / EPU) - Computation of Basic and Diluted EPS / EPU (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Numerator:
Net Income Available to Common Stockholders / Unitholders	$ 287,343	$ 274,584	$ 358,786
Denominator:
Weighted Average Shares/Units - Basic	132,369	132,264	132,024
Performance Units/Performance Units and certain Performance RLP Units	47	77	79
Weighted Average Shares / Units - Diluted	132,416	132,341	132,103
Basic Earnings Per Share / Unit:
Net Income Available to Common Stockholders/Unitholders	$ 2.17	$ 2.08	$ 2.72
Diluted Earnings Per Share / Unit:
Net Income Available to Common Stockholders/Unitholders	$ 2.17	$ 2.07	$ 2.72
First Industrial, L.P.
Numerator:
Net Income Available to Common Stockholders / Unitholders	$ 294,670	$ 281,150	$ 366,642
Denominator:
Weighted Average Shares/Units - Basic	135,092	134,777	134,229
Performance Units/Performance Units and certain Performance RLP Units	334	472	452
Weighted Average Shares / Units - Diluted	135,426	135,249	134,681
Basic Earnings Per Share / Unit:
Net Income Available to Common Stockholders/Unitholders	$ 2.18	$ 2.09	$ 2.73
Diluted Earnings Per Share / Unit:
Net Income Available to Common Stockholders/Unitholders	$ 2.18	$ 2.08	$ 2.72