Net (Loss) Income Per Share - Computation of Basic and Diluted Net (Loss) Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share [Abstract]
Net (loss) income	$ (3,545)	$ (333)	$ (19,899)	$ (5,505)	$ 287	$ (3,018)	$ 315	$ 486	$ (29,282)	$ (1,930)	$ 28,068
Weighted average common basic shares									41,085	41,030	40,985
Effect of dilutive securities											298
Weighted average common dilutive shares									41,085	41,030	41,283
Basic and diluted net (loss) income per share	$ (0.09)	$ (0.01)	$ (0.48)	$ (0.13)		$ (0.07)	$ 0.01	$ 0.01	$ (0.71)	$ (0.05)	$ 0.68