Stockholders’ Equity of the Company and Partners' Capital of the Operating Partnership - Common Stock and Units Roll-Forward (Details) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Class of Stock [Line Items]
Common Stock/Units, Outstanding, Beginning Balance	126,307,431
Limited Partners' Capital Account, Units Retired		(33,333)
Common Stock/Units, Outstanding, Ending Balance	126,994,478	126,307,431
Common Stock / Operating Partnership Units
Class of Stock [Line Items]
Common Stock/Units, Outstanding, Beginning Balance	126,307,431	119,883,180	117,107,746
Issuance of Common Stock/Contribution of General Partner Units		4,800,000	2,560,000
Issuance of Restricted Stock/Units Awards	109,353	227,059	275,793
Vesting of LTIP Unit Awards	169,033	150,772
Repurchase and Retirement of Restricted Stock/Unit Awards	(76,855)	(104,301)	(91,513)
Conversion of Limited Partner Units	485,516	1,350,721	31,154
Limited Partners' Capital Account, Units Retired		0
Common Stock/Units, Outstanding, Ending Balance	126,994,478	126,307,431	119,883,180
First Industrial, L.P. | Common Stock / Operating Partnership Units
Class of Stock [Line Items]
Common Stock/Units, Outstanding, Beginning Balance	128,931,598	123,891,401	121,147,121
Issuance of Common Stock/Contribution of General Partner Units		4,800,000	2,560,000
Issuance of Restricted Stock/Units Awards	406,569	227,059	275,793
Vesting of LTIP Unit Awards	169,033	150,772
Repurchase and Retirement of Restricted Stock/Unit Awards	(89,978)	(104,301)	(91,513)
Conversion of Limited Partner Units	0	0	0
Limited Partners' Capital Account, Units Retired		(33,333)
Common Stock/Units, Outstanding, Ending Balance	129,417,222	128,931,598	123,891,401