Reconciliation of Shares Used to Determine Net Income per Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share Disclosure [Line Items]
Net (loss) income	$ (5,842)	$ 12,801
Weighted average number of shares - basic	24,826,101	23,906,706
Weighted average number of shares outstanding - diluted	24,826,101	26,353,960
Warrants
Earnings Per Share Disclosure [Line Items]
Shares underlying	0	315,494
Options
Earnings Per Share Disclosure [Line Items]
Shares underlying	0	2,131,760