Summary of Significant Accounting Policies - Summary of New Accounting Pronouncements (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Summary of New Accounting Pronouncement [Line Items]
Total Assets	$ 2,706,680	$ 2,581,995
Total Liabilities	1,626,946	1,491,168
First Industrial, L.P.
Summary of New Accounting Pronouncement [Line Items]
Total Assets	2,717,493	2,592,708
Total Liabilities	1,626,946	1,491,118
Noncontrolling Interest	$ 1,131	1,080
Previously Reported | First Industrial, L.P.
Summary of New Accounting Pronouncement [Line Items]
Total Assets		2,514,246
Total Liabilities		1,413,736
Noncontrolling Interest		0
Restatement Adjustment | First Industrial, L.P.
Summary of New Accounting Pronouncement [Line Items]
Total Assets		78,462
Total Liabilities		77,382
Noncontrolling Interest		$ 1,080