Earnings Per Share (EPS) - Computation of Basic and Diluted EPS (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Numerator:
Income from Continuing Operations	$ 14,568	$ 3,152	$ 17,034	$ 7,078
Noncontrolling Interest Allocable to Continuing Operations	(556)	(124)	(649)	(182)
Income from Continuing Operations Allocable to Participating Securities	(50)	(32)	(91)	(50)
Income from Continuing Operations Attributable to First Industrial Realty Trust, Inc.	13,962	2,996	16,294	6,846
Preferred Dividends	0	0	0	(1,019)
Redemption of Preferred Stock	0	0	0	(1,462)
Income from Continuing Operations Available to First Industrial Realty Trust, Inc.’s Common Stockholders	13,962	2,996	16,294	4,365
Income from Discontinued Operations	0	1,052	0	2,193
Noncontrolling Interest Allocable to Discontinued Operations	0	(41)	0	(87)
Income from Discontinued Operations Allocable to Participating Securities	0	(11)	0	(25)
Income from Discontinued Operations Attributable to First Industrial Realty Trust, Inc.	0	1,000	0	2,081
Net Income Available to First Industrial Realty Trust, Inc.’s Common Stockholders and Participating Securities	14,012	4,039	16,385	6,521
Net Income Allocable to Participating Securities	(50)	(43)	(91)	(75)
Net Income Available to First Industrial Realty Trust, Inc.’s Common Stockholders	$ 13,962	$ 3,996	$ 16,294	$ 6,446
Denominator:
Weighted Average Shares - Basic	110,348	109,815	110,329	109,746
LTIP performance units	335	589	350	564
Weighted Average Shares - Diluted	110,683	110,404	110,679	110,310
Basic and Diluted EPS:
Income from Continuing Operations Available to First Industrial Realty Trust, Inc.’s Common Stockholders	$ 0.13	$ 0.03	$ 0.15	$ 0.04
Income from Discontinued Operations Attributable to First Industrial Realty Trust, Inc.’s Common Stockholders	0.00	0.01	0.00	0.02
Net Income Available to First Industrial Realty Trust, Inc.’s Common Stockholders	$ 0.13	$ 0.04	$ 0.15	$ 0.06