Quarterly Financial Information - Net Income (loss) Available to Common Stockholders and Basic and Diluted EPS (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Total Revenues	$ 90,333	$ 86,361	$ 84,044	$ 83,861	$ 81,620	$ 79,071	$ 79,576	$ 78,187	$ 344,599	$ 318,454	$ 304,517
Equity in Income (Loss) of Joint Ventures	(9)	(14)	556	2,966	17	72	27	20	3,499	136	1,559
Noncontrolling Interest Allocable to Continuing Operations	(309)	(325)	(124)	(58)	(47)	13	308	159	813	(396)	(2,173)
Income (Loss) from Continuing Operations, Net of Noncontrolling Interest	7,615	7,938	3,028	3,868	2,192	3,182	(1,341)	372
Income (Loss) from Discontinued Operations	11,698	13,932	1,052	1,141	19,850	5,303	13,011	(1,598)	27,823	36,566	18,767
Noncontrolling Interest Allocable to Discontinued Operations	(452)	(543)	(41)	(46)	(817)	(220)	(553)	73	(1,082)	(1,517)	(972)
Gain (Loss) on Sale of Real Estate, Net of Income Tax	(83)	0	0	0	337	291	0	262	(83)	890	3,777
Noncontrolling Interest Allocable to Gain (Loss) on Sale of Real Estate	3	0	0	0	(13)	(12)	0	(12)
Net Income (Loss) Attributable to First Industrial Realty Trust, Inc.	18,781	21,327	4,039	4,963	21,549	8,544	11,117	(903)	49,110	40,307	(1,318)
Preferred Dividends	0	0	0	(1,019)	(1,227)	(1,392)	(2,277)	(3,837)	(1,019)	(8,733)	(18,947)
Redemption of Preferred Stock	0	0	0	(1,462)	0	(2,121)	(3,546)	0	(1,462)	(5,667)	(1,804)
Net Income (Loss) Available to First Industrial Realty Trust, Inc.’s Common Stockholders and Participating Securities	18,781	21,327	4,039	2,482	20,322	5,031	5,294	(4,740)	46,629	25,907	(22,069)
Income From Continuing Operations Allocable to Participating Securities	(32)	(33)	(32)	(18)	(6)	0	0	(36)	(75)	0	0
Income from Discontinued Operations Allocable to Participating Securities	(47)	(57)	(11)	(14)	(84)	(42)	(42)	0	(100)	(162)	0
Net (Loss) Income Available to First Industrial Realty Trust, Inc.'s Common Stockholders	$ 18,702	$ 21,237	$ 3,996	$ 2,450	$ 20,232	$ 4,989	$ 5,252	$ (4,776)
Basic and Diluted Earnings Per Share:
Income (Loss) from Continuing Operations Available to First Industrial Realty Trust, Inc.’s Common Stockholders	$ 0.07	$ 0.07	$ 0.03	$ 0.01	$ 0.01	$ 0.00	$ (0.06)	$ (0.03)	$ 0.18	$ (0.09)	$ (0.44)
Income (Loss) from Discontinued Operations Attributable to First Industrial Realty Trust, Inc.'s Common Stockholders	$ 0.10	$ 0.12	$ 0.01	$ 0.01	$ 0.17	$ 0.05	$ 0.11	$ (0.02)	$ 0.24	$ 0.33	$ 0.20
Net Income (Loss) Available to First Industrial Realty Trust, Inc.'s Common Stockholders	$ 0.17	$ 0.19	$ 0.04	$ 0.02	$ 0.18	$ 0.05	$ 0.05	$ (0.05)	$ 0.42	$ 0.24	$ (0.24)
Weighted Average Shares - Basic	110,118	110,072	109,815	109,676	109,490	109,474	108,117	100,774	109,922	106,995	91,468
LTIP Unit Awards	287	199	589	539	485	0	0	0	403	0	0
Weighted Average Shares - Diluted	110,405	110,271	110,404	110,215	109,975	109,474	108,117	100,774	110,325	106,995	91,468