Cover - shares	6 Months Ended
	Jun. 30, 2019	Jul. 26, 2019
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2019
Document Transition Report	false
Entity File Number	1-13102
Entity Registrant Name	FIRST INDUSTRIAL REALTY TRUST INC
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	36-3935116
Entity Address, Street Name	1 N. Wacker Drive
Entity Address, Suite	Suite 4200
Entity Address, City	Chicago
Entity Address, State	IL
Entity Address, Postal Zip Code	60606
City Area Code	312
Local Phone Number	344-4300
Title of each class:	Common Stock, par value $.01 per share
Trading Symbol(s):	FR
Name of each exchange on which registered:	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Entity Central Index Key	0000921825
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		126,487,215
First Industrial, L.P.
Entity Information [Line Items]
Entity File Number	333-21873
Entity Registrant Name	FIRST INDUSTRIAL LP
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	36-3924586
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Amendment Flag	false
Entity Central Index Key	0001033128
Current Fiscal Year End Date	--12-31