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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, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator
Net income (loss)	$ 752	$ (9,969)	$ 3,995	$ 770	$ (9,217)	$ 4,765
Denominator
Weighted average number of shares – basic	47,958		47,802		47,957	47,792
Effect of dilutive securities
Stock options			7
PSUs, RSUs and restricted stock	296		227			147
Weighted average number of shares – diluted	48,254		48,036		47,957	47,939
Earnings (loss) per share – basic	$ 0.02		$ 0.08		$ (0.19)	$ 0.10
Earnings (loss) per share – diluted	$ 0.02		$ 0.08		$ (0.19)	$ 0.10

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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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