Summary of Significant Accounting Policies - Reconciliation of Weighted-Average Common Shares Outstanding Used in Calculation of Basic EPS to Diluted EPS (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]
Net income (loss)	$ 1,967	$ (273)	$ (8,773)	$ 793
Earnings (loss) per common share:
Basic	$ 0.09	$ (0.01)	$ (0.39)	$ 0.04
Diluted	$ 0.09	$ (0.01)	$ (0.39)	$ 0.04
Determination of shares:
Weighted-average common shares outstanding, basic	22,255	22,228	22,238	22,228
Assumed conversion of restricted stock awards	181			208
Weighted-average common shares outstanding, diluted	22,436	22,228	22,238	22,436