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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, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Numerator
Net income (loss)	$ 5,481	$ 752	$ (9,969)	$ (46,123)	$ 3,995	$ 770	$ (3,736)	$ (41,358)
Denominator
Weighted average number of shares – basic	47,957			47,824			47,957	47,803
Effect of dilutive securities
PSUs, RSUs and restricted stock	467
Weighted average number of shares – diluted	48,424			47,824			47,957	47,803
Earnings (loss) per share – basic	$ 0.11			$ (0.96)			$ (0.08)	$ (0.87)
Earnings (loss) per share – diluted	$ 0.11			$ (0.96)			$ (0.08)	$ (0.87)

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