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, 2022	Dec. 31, 2021	Dec. 31, 2020
Numerator:
Net Income Available to Common Stockholders / Unitholders and Participating Securities	$ 359,134	$ 270,997	$ 195,989
Net Income Allocable to Participating Securities	(348)	(299)	(314)
Net Income Available to Common Stockholders / Unitholders	$ 358,786	$ 270,698	$ 195,675
Denominator:
Weighted Average Shares/Units - Basic	132,024	129,688	127,711
Performance Units/Performance Units and certain Performance RLP Units	79	87	193
Weighted Average Shares / Units - Diluted	132,103	129,775	127,904
Basic Earnings Per Share / Unit:
Net Income Available to Common Stockholders/Unitholders	$ 2.72	$ 2.09	$ 1.53
Diluted Earnings Per Share / Unit:
Net Income Available to Common Stockholders/Unitholders	$ 2.72	$ 2.09	$ 1.53
First Industrial, L.P.
Numerator:
Net Income Available to Common Stockholders / Unitholders and Participating Securities	$ 367,519	$ 277,038	$ 199,934
Net Income Allocable to Participating Securities	(877)	(770)	(662)
Net Income Available to Common Stockholders / Unitholders	$ 366,642	$ 276,268	$ 199,272
Denominator:
Weighted Average Shares/Units - Basic	134,229	131,740	129,752
Performance Units/Performance Units and certain Performance RLP Units	452	497	375
Weighted Average Shares / Units - Diluted	134,681	132,237	130,127
Basic Earnings Per Share / Unit:
Net Income Available to Common Stockholders/Unitholders	$ 2.73	$ 2.10	$ 1.54
Diluted Earnings Per Share / Unit:
Net Income Available to Common Stockholders/Unitholders	$ 2.72	$ 2.09	$ 1.53