Reconciliation of Net Income (Loss) Per Share - Summary of Reconciliation of Net Income (Loss) Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share [Abstract]
Net income (Loss)									$ (7,431)	$ 8,217	$ 17,178
Weighted average shares outstanding	26,840	26,839	19,215	18,996	18,970	17,979	17,779	17,656	21,181	17,887	17,176
Effect of dilutive stock options		328	367	384	347		393	306		366	84
Diluted shares outstanding	26,840	27,167	19,582	19,380	19,317	17,979	18,172	17,962	21,181	18,253	17,260
Basic net income (loss) per share	$ (0.93)	$ 0.17	$ 0.36	$ 0.32	$ 0.09	$ (0.21)	$ 0.29	$ 0.30	$ (0.35)	$ 0.46	$ 1.00
Diluted net income (loss) per share	$ (0.93)	$ 0.17	$ 0.36	$ 0.31	$ 0.08	$ (0.21)	$ 0.29	$ 0.29	$ (0.35)	$ 0.45	$ 1.00