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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				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator
Net Income (Loss)	$ 3,995	$ 770	$ (7,670)	$ (10,814)	$ 4,765	$ (18,484)
Denominator
Weighted average number of shares – basic	47,802		47,856		47,792	48,043
Effect of dilutive securities
Stock options	7
PSUs, RSUs and restricted stock	227				147
Weighted average number of shares – diluted	48,036		47,856		47,939	48,043
Earnings (loss) per share – basic	$ 0.08		$ (0.16)		$ 0.10	$ (0.38)
Earnings (loss) per share – diluted	$ 0.08		$ (0.16)		$ 0.10	$ (0.38)

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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