CONSOLIDATED STATEMENT OF CHANGES IN EQUITY/ PARTNERS' CAPITAL - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Distributions in Excess of Accumulated Earnings	Accumulated Other Comprehensive (Loss) Income	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 (Loss) Income	First Industrial, L.P. Noncontrolling Interests
Beginning Balance at Dec. 31, 2020	$ 1,947,320	$ 1,290	$ 2,224,691	$ (306,294)	$ (16,953)	$ 44,586
Beginning Balance at Dec. 31, 2020							$ 1,956,690	$ 1,898,635	$ 70,435	$ (17,308)	$ 4,928
Increase (Decrease) in Equity / Partners' Capital [Roll Forward]
Net Income	63,583			62,198		1,385	63,583	62,176	1,389		18
Other Comprehensive Income (Loss)	6,755				6,607	148	6,755			6,755
Stock Based Compensation Activity	(1,055)	1	(1,347)	(2,294)		2,585
Stock Based Compensation Activity							(1,055)	(3,640)	2,585
Common Stock Dividends and Unit Distributions	(35,718)			(34,933)		(785)
Unit Distributions							(35,718)	(34,933)	(785)
Conversion of Limited Partner Units to Common Stock / General Partner Units	0	0	22			(22)	0	22	(22)
Reallocation - Additional Paid-in Capital	0		(2,110)			2,110
Reallocation - Other Comprehensive Income	0				34	(34)
Contributions from Noncontrolling Interests							29				29
Distributions to Noncontrolling Interests							(24)				(24)
Ending Balance at Mar. 31, 2021	1,980,885	1,291	2,221,256	(281,323)	(10,312)	49,973
Ending Balance at Mar. 31, 2021							1,990,260	1,922,260	73,602	(10,553)	4,951
Beginning Balance at Dec. 31, 2020	1,947,320	1,290	2,224,691	(306,294)	(16,953)	44,586
Beginning Balance at Dec. 31, 2020							1,956,690	1,898,635	70,435	(17,308)	4,928
Increase (Decrease) in Equity / Partners' Capital [Roll Forward]
Net Income	160,163						160,163
Conversion of Limited Partner Units to Common Stock / General Partner Units	0	1	1,386			(1,387)	0	1,387	(1,387)
Ending Balance at Sep. 30, 2021	2,073,582	1,303	2,287,232	(257,092)	(8,386)	50,525
Ending Balance at Sep. 30, 2021							2,082,911	2,008,725	77,815	(8,575)	4,946
Beginning Balance at Mar. 31, 2021	1,980,885	1,291	2,221,256	(281,323)	(10,312)	49,973
Beginning Balance at Mar. 31, 2021							1,990,260	1,922,260	73,602	(10,553)	4,951
Increase (Decrease) in Equity / Partners' Capital [Roll Forward]
Net Income	53,161			51,936		1,225	53,161	51,913	1,227		21
Other Comprehensive Income (Loss)	292				282	10	292			292
Stock Based Compensation Activity	3,451	0	1,023	0		2,428
Stock Based Compensation Activity							3,451	1,023	2,428
Common Stock Dividends and Unit Distributions	(35,741)			(34,930)		(811)
Unit Distributions							(35,741)	(34,930)	(811)
Reallocation - Additional Paid-in Capital	0		2,282			(2,282)
Reallocation - Other Comprehensive Income	0				4	(4)
Distributions to Noncontrolling Interests							(23)				(23)
Ending Balance at Jun. 30, 2021	2,002,048	1,291	2,224,561	(264,317)	(10,026)	50,539
Ending Balance at Jun. 30, 2021							2,011,400	1,940,266	76,446	(10,261)	4,949
Increase (Decrease) in Equity / Partners' Capital [Roll Forward]
Net Income	43,419			42,446		973	43,419	42,424	975		20
Other Comprehensive Income (Loss)	1,686				1,648	38	1,686			1,686
Issuance of Common Stock/Contribution of General Partner Units, Net of Issuance Costs	58,811	11	58,800				58,811	58,811
Stock Based Compensation Activity	3,508	0	1,080	0		2,428
Stock Based Compensation Activity							3,508	1,080	2,428
Common Stock Dividends and Unit Distributions	(35,890)			(35,221)		(669)
Unit Distributions							(35,890)	(35,221)	(669)
Conversion of Limited Partner Units to Common Stock / General Partner Units	0	1	1,364			(1,365)	0	1,365	(1,365)
Reallocation - Additional Paid-in Capital	0		1,427			(1,427)
Reallocation - Other Comprehensive Income	0				(8)	8
Contributions from Noncontrolling Interests							6				6
Distributions to Noncontrolling Interests							(29)				(29)
Ending Balance at Sep. 30, 2021	2,073,582	1,303	2,287,232	(257,092)	(8,386)	50,525
Ending Balance at Sep. 30, 2021							2,082,911	2,008,725	77,815	(8,575)	4,946
Beginning Balance at Dec. 31, 2021	2,248,372	1,317	2,376,026	(178,293)	(4,238)	53,560
Beginning Balance at Dec. 31, 2021							2,257,607	2,175,549	81,435	(4,331)	4,954
Increase (Decrease) in Equity / Partners' Capital [Roll Forward]
Net Income	37,123			36,258		865	37,123	36,237	868		18
Other Comprehensive Income (Loss)	11,197				10,935	262	11,197			11,197
Issuance of Common Stock/Contribution of General Partner Units, Net of Issuance Costs	12,746	2	12,744				12,746	12,746
Stock Based Compensation Activity	2,721	1	(198)	(1,483)		4,401
Stock Based Compensation Activity							2,721	(1,680)	4,401
Common Stock Dividends and Unit Distributions	(39,887)			(39,009)		(878)
Unit Distributions							(39,887)	(39,009)	(878)
Conversion of Limited Partner Units to Common Stock / General Partner Units	0	0	36			(36)	0	36	(36)
Reallocation - Additional Paid-in Capital	0		12			(12)
Reallocation - Other Comprehensive Income	0				6	(6)
Contributions from Noncontrolling Interests	103					103	112				112
Distributions to Noncontrolling Interests							(40)				(40)
Ending Balance at Mar. 31, 2022	2,272,375	1,320	2,388,620	(182,527)	6,703	58,259
Ending Balance at Mar. 31, 2022							2,281,579	2,183,879	85,790	6,866	5,044
Beginning Balance at Dec. 31, 2021	2,248,372	1,317	2,376,026	(178,293)	(4,238)	53,560
Beginning Balance at Dec. 31, 2021							2,257,607	2,175,549	81,435	(4,331)	4,954
Increase (Decrease) in Equity / Partners' Capital [Roll Forward]
Net Income	297,674						297,674
Conversion of Limited Partner Units to Common Stock / General Partner Units	0	1	2,711			(2,712)	0	2,712	(2,712)
Ending Balance at Sep. 30, 2022	2,486,444	1,321	2,397,977	(19,757)	36,390	70,513
Ending Balance at Sep. 30, 2022							2,495,736	2,351,482	91,963	37,234	15,057
Beginning Balance at Mar. 31, 2022	2,272,375	1,320	2,388,620	(182,527)	6,703	58,259
Beginning Balance at Mar. 31, 2022							2,281,579	2,183,879	85,790	6,866	5,044
Increase (Decrease) in Equity / Partners' Capital [Roll Forward]
Net Income	133,676			116,991		16,685	133,676	116,969	2,450		14,257
Other Comprehensive Income (Loss)	5,799				5,665	134	5,799			5,799
Stock Based Compensation Activity	3,893	0	1,074	0		2,819
Stock Based Compensation Activity							3,893	1,074	2,819
Common Stock Dividends and Unit Distributions	(39,766)			(39,008)		(758)
Unit Distributions							(39,766)	(39,008)	(758)
Conversion of Limited Partner Units to Common Stock / General Partner Units	0	1	1,234			(1,235)	0	1,235	(1,235)
Reallocation - Additional Paid-in Capital	0		2,534			(2,534)
Reallocation - Other Comprehensive Income	0				3	(3)
Contributions from Noncontrolling Interests							1				1
Distributions to Noncontrolling Interests	(4,418)					(4,418)	(4,449)				(4,449)
Ending Balance at Jun. 30, 2022	2,371,559	1,321	2,393,462	(104,544)	12,371	68,949
Ending Balance at Jun. 30, 2022							2,380,733	2,264,149	89,066	12,665	14,853
Increase (Decrease) in Equity / Partners' Capital [Roll Forward]
Net Income	126,875			123,888		2,987	126,875	123,866	2,923		86
Other Comprehensive Income (Loss)	24,569				24,001	568	24,569			24,569
Stock Based Compensation Activity	3,584	0	1,127	0		2,457
Stock Based Compensation Activity							3,584	1,127	2,457
Common Stock Dividends and Unit Distributions	(40,143)			(39,101)		(1,042)
Unit Distributions							(40,143)	(39,101)	(1,042)
Conversion of Limited Partner Units to Common Stock / General Partner Units	0	0	1,441			(1,441)	0	1,441	(1,441)
Reallocation - Additional Paid-in Capital	0		1,947			(1,947)
Reallocation - Other Comprehensive Income	0				18	(18)
Contributions from Noncontrolling Interests							129				129
Distributions to Noncontrolling Interests							(11)				(11)
Ending Balance at Sep. 30, 2022	$ 2,486,444	$ 1,321	$ 2,397,977	$ (19,757)	$ 36,390	$ 70,513
Ending Balance at Sep. 30, 2022							$ 2,495,736	$ 2,351,482	$ 91,963	$ 37,234	$ 15,057