CONSOLIDATED STATEMENT OF CHANGES IN EQUITY/ PARTNERS' CAPITAL - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests	First Industrial, L.P.	First Industrial, L.P. General Partner Units	First Industrial, L.P. Limited Partner Units	First Industrial, L.P. Accumulated Other Comprehensive Income (Loss)	First Industrial, L.P. Noncontrolling Interests
Beginning Balance at Dec. 31, 2023	$ 2,635,105	$ 1,323	$ 2,411,673	$ 127,707	$ 22,272	$ 72,130
Beginning Balance at Dec. 31, 2023							$ 2,644,388	$ 2,505,150	$ 109,003	$ 22,842	$ 7,393
Increase (Decrease) in Equity / Partners' Capital [Roll Forward]
Net Income	70,498			68,452		2,046	70,498	68,404	1,871		223
Other Comprehensive Income (Loss)	10,423				10,146	277	10,423			10,423
Stock Based Compensation Activity	7,674	0	(323)	(6)		8,003
Stock Based Compensation Activity							7,674	(329)	8,003
Common Stock Dividends and Unit Distributions	(50,309)			(49,049)		(1,260)
Unit Distributions							(50,309)	(49,049)	(1,260)
Conversion of Limited Partner Units to Common Stock / General Partner Units	0	0	7			(7)	0	7	(7)
Retirement of Limited Partner Units	(25)					(25)	(25)		(25)
Reallocation - Additional Paid-in Capital	0		3,007			(3,007)
Reallocation - Other Comprehensive Income	0				(44)	44
Contributions from Noncontrolling Interests							5				5
Distributions to Noncontrolling Interests	(98)					(98)	(113)				(113)
Ending Balance at Mar. 31, 2024	2,673,268	1,323	2,414,364	147,104	32,374	78,103
Ending Balance at Mar. 31, 2024							2,682,541	2,524,183	117,585	33,265	7,508
Beginning Balance at Dec. 31, 2024	2,746,028	1,323	2,425,253	219,095	19,936	80,421
Beginning Balance at Dec. 31, 2024							2,755,257	2,598,962	127,870	20,485	7,940
Increase (Decrease) in Equity / Partners' Capital [Roll Forward]
Net Income	52,884			48,103		4,781	52,884	48,071	1,475		3,338
Other Comprehensive Income (Loss)	(7,909)				(7,674)	(235)	(7,909)			(7,909)
Stock Based Compensation Activity	13,073	1	320	271		12,481
Stock Based Compensation Activity							13,073	592	12,481
Common Stock Dividends and Unit Distributions	(60,854)			(59,035)		(1,819)
Unit Distributions							(60,854)	(59,035)	(1,819)
Conversion of Limited Partner Units to Common Stock / General Partner Units	0	0	27			(27)	0	27	(27)
Reallocation - Additional Paid-in Capital	0		3,520			(3,520)
Reallocation - Other Comprehensive Income	0				(63)	63
Contributions from Noncontrolling Interests							6				6
Distributions to Noncontrolling Interests							(25)				(25)
Ending Balance at Mar. 31, 2025	$ 2,743,222	$ 1,324	$ 2,429,120	$ 208,434	$ 12,199	$ 92,145
Ending Balance at Mar. 31, 2025							$ 2,752,432	$ 2,588,617	$ 139,980	$ 12,576	$ 11,259