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, 2022	$ 2,530,299	$ 1,321	$ 2,401,334	$ 23,131	$ 33,412	$ 71,101
Beginning Balance at Dec. 31, 2022							$ 2,539,580	$ 2,395,601	$ 95,015	$ 34,186	$ 14,778
Increase (Decrease) in Equity / Partners' Capital [Roll Forward]
Net Income	60,775			55,967		4,808	60,775	55,947	1,447		3,381
Other Comprehensive Income (Loss)	(12,918)				(12,592)	(326)	(12,918)			(12,918)
Stock Based Compensation Activity	4,627	1	(412)	(710)		5,748
Stock Based Compensation Activity							4,627	(1,121)	5,748
Common Stock Dividends and Unit Distributions	(43,460)			(42,401)		(1,059)
Unit Distributions							(43,460)	(42,401)	(1,059)
Conversion of Limited Partner Units to Common Stock / General Partner Units	0		513			(513)	0	513	(513)
Reallocation - Additional Paid-in Capital	0		(1,166)			1,166
Reallocation - Other Comprehensive Income	0				(88)	88
Contributions from Noncontrolling Interests							1				1
Distributions to Noncontrolling Interests	(11,358)					(11,358)	(11,359)				(11,359)
Ending Balance at Mar. 31, 2023	2,527,965	1,322	2,400,269	35,987	20,732	69,655
Ending Balance at Mar. 31, 2023							2,537,246	2,408,539	100,638	21,268	6,801
Beginning Balance at Dec. 31, 2022	2,530,299	1,321	2,401,334	23,131	33,412	71,101
Beginning Balance at Dec. 31, 2022							2,539,580	2,395,601	95,015	34,186	14,778
Increase (Decrease) in Equity / Partners' Capital [Roll Forward]
Net Income	117,009						117,009
Conversion of Limited Partner Units to Common Stock / General Partner Units	0	0	664			(664)	0	664	(664)
Ending Balance at Jun. 30, 2023	2,561,839	1,323	2,403,397	48,217	38,219	70,683
Ending Balance at Jun. 30, 2023							2,571,117	2,422,186	102,779	39,207	6,945
Beginning Balance at Mar. 31, 2023	2,527,965	1,322	2,400,269	35,987	20,732	69,655
Beginning Balance at Mar. 31, 2023							2,537,246	2,408,539	100,638	21,268	6,801
Increase (Decrease) in Equity / Partners' Capital [Roll Forward]
Net Income	56,234			54,636		1,598	56,234	54,613	1,410		211
Other Comprehensive Income (Loss)	17,939				17,487	452	17,939			17,939
Stock Based Compensation Activity	3,218	1	1,288	(2)		1,931
Stock Based Compensation Activity							3,218	1,287	1,931
Common Stock Dividends and Unit Distributions	(43,453)			(42,404)		(1,049)
Unit Distributions							(43,453)	(42,404)	(1,049)
Conversion of Limited Partner Units to Common Stock / General Partner Units	0		151			(151)	0	151	(151)
Reallocation - Additional Paid-in Capital	0		1,689			(1,689)
Contributions from Noncontrolling Interests							2				2
Distributions to Noncontrolling Interests	(64)					(64)	(69)				(69)
Ending Balance at Jun. 30, 2023	2,561,839	1,323	2,403,397	48,217	38,219	70,683
Ending Balance at Jun. 30, 2023							2,571,117	2,422,186	102,779	39,207	6,945
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, 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	123,374						123,374
Conversion of Limited Partner Units to Common Stock / General Partner Units	0	0	7			(7)	0	7	(7)
Ending Balance at Jun. 30, 2024	2,679,179	1,323	2,418,232	149,413	31,653	78,558
Ending Balance at Jun. 30, 2024							2,688,438	2,527,596	120,695	32,527	7,620
Beginning Balance at Mar. 31, 2024	2,673,268	1,323	2,414,364	147,104	32,374	78,103
Beginning Balance at Mar. 31, 2024							2,682,541	2,524,183	117,585	33,265	7,508
Increase (Decrease) in Equity / Partners' Capital [Roll Forward]
Net Income	52,876			51,318		1,558	52,876	51,291	1,414		171
Other Comprehensive Income (Loss)	(738)				(720)	(18)	(738)			(738)
Stock Based Compensation Activity	3,866		1,131	0		2,735
Stock Based Compensation Activity							3,866	1,131	2,735
Common Stock Dividends and Unit Distributions	(50,048)			(49,009)		(1,039)
Unit Distributions							(50,048)	(49,009)	(1,039)
Reallocation - Additional Paid-in Capital	0		2,737			(2,737)
Reallocation - Other Comprehensive Income	0				(1)	1
Contributions from Noncontrolling Interests							9				9
Distributions to Noncontrolling Interests	(45)					(45)	(68)				(68)
Ending Balance at Jun. 30, 2024	$ 2,679,179	$ 1,323	$ 2,418,232	$ 149,413	$ 31,653	$ 78,558
Ending Balance at Jun. 30, 2024							$ 2,688,438	$ 2,527,596	$ 120,695	$ 32,527	$ 7,620