Earnings Per Share (EPS) - Computation of Basic and Diluted EPS (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Numerator:
Income from Continuing Operations	$ 2,466	$ 3,926
Noncontrolling Interest Allocable to Continuing Operations	(93)	(58)
Income from Continuing Operations Allocable to Participating Securities	(41)	(18)
Income from Continuing Operations Attributable to First Industrial Realty Trust, Inc.	2,332	3,850
Preferred Dividends	0	(1,019)
Redemption of Preferred Stock	0	(1,462)
Income from Continuing Operations Available to First Industrial Realty Trust, Inc.’s Common Stockholders	2,332	1,369
Income from Discontinued Operations	0	1,141
Noncontrolling Interest Allocable to Discontinued Operations	0	(46)
Income from Discontinued Operations Allocable to Participating Securities	0	(14)
Income from Discontinued Operations Attributable to First Industrial Realty Trust, Inc.	0	1,081
Net Income Available to First Industrial Realty Trust, Inc.’s Common Stockholders and Participating Securities	2,373	2,482
Net Income Allocable to Participating Securities	(41)	(32)
Net Income Available to First Industrial Realty Trust, Inc.’s Common Stockholders	$ 2,332	$ 2,450
Denominator:
Weighted Average Shares - Basic	110,310	109,676
LTIP Unit Awards (as defined in Note 9)	365	539
Weighted Average Shares - Diluted	110,675	110,215
Basic and Diluted EPS:
Income from Continuing Operations Available to First Industrial Realty Trust, Inc.’s Common Stockholders	$ 0.02	$ 0.01
Income from Discontinued Operations Attributable to First Industrial Realty Trust, Inc.’s Common Stockholders	$ 0.00	$ 0.01
Net Income Available to First Industrial Realty Trust, Inc.’s Common Stockholders	$ 0.02	$ 0.02