Net Income Per Share - Computation of Basic and Diluted Net Income Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share [Abstract]
Net income	$ 3,469	$ 2,066	$ 3,980	$ 4,090
Weighted average common basic shares	40,978	40,921	40,974	40,915
Effect of dilutive securities	296	27	304	27
Weighted average common dilutive shares	41,274	40,948	41,278	40,942
Basic and diluted net income per share	$ 0.08	$ 0.05	$ 0.10	$ 0.10