Earnings (Loss) Per Share - Summary of Calculation of Basic and Diluted Earnings (Loss) Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Numerator
Net Income (Loss)	$ (11,624)	$ (46,123)	$ 3,995	$ 770	$ (8,447)	$ 7,589	$ (7,670)	$ (10,814)	$ (52,982)	$ (19,342)	$ 23,840
Denominator
Weighted average number of shares – basic									47,836	47,880	48,153
Effect of dilutive securities:
Stock options											406
Restricted stock and restricted stock units											140
Weighted average number of shares – diluted									47,836	47,880	48,699
Earnings (loss) per share – basic	$ (0.25)	$ (0.96)	$ 0.08	$ 0.02	$ (0.18)	$ 0.16	$ (0.16)	$ (0.22)	$ (1.11)	$ (0.40)	$ 0.50
Earnings (loss) per share – diluted	$ (0.25)	$ (0.96)	$ 0.08	$ 0.02	$ (0.18)	$ 0.16	$ (0.16)	$ (0.22)	$ (1.11)	$ (0.40)	$ 0.49