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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						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator
Net Income (Loss)	$ (46,123)	$ 3,995	$ 770	$ 7,589	$ (7,670)	$ (10,814)	$ (41,358)	$ (10,895)
Denominator
Weighted average number of shares – basic	47,824			47,710			47,803	47,927
Effect of dilutive securities
Stock options				27
PSUs, RSUs and restricted stock				97
Weighted average number of shares – diluted	47,824			47,834			47,803	47,927
Earnings (loss) per share – basic	$ (0.96)			$ 0.16			$ (0.87)	$ (0.23)
Earnings (loss) per share – diluted	$ (0.96)			$ 0.16			$ (0.87)	$ (0.23)

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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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