Reconciliation of Shares Used to Determine Net Income per Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Earnings Per Share Disclosure [Line Items]
Net income	$ 160	$ 4,469
Weighted average number of shares - basic	25,090,386	24,334,966
Weighted average number of shares outstanding - diluted	26,851,678	26,751,714
Warrants
Earnings Per Share Disclosure [Line Items]
Shares underlying	293,234	476,877
Options
Earnings Per Share Disclosure [Line Items]
Shares underlying	1,468,057	1,939,871