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Earnings (Loss) Per Share - Summary of Calculations 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, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Numerator
Net Income (Loss)	$ 6,114	$ 5,481	$ 752	$ (9,969)	$ (11,624)	$ (46,123)	$ 3,995	$ 770	$ 2,378	$ (52,982)	$ (19,342)
Denominator
Weighted average number of shares – basic									47,996	47,836	47,880
Effect of dilutive securities:
PSUs, RSUs and restricted stock									292
Weighted average number of shares – diluted									48,288	47,836	47,880
Earnings (loss) per share – basic	$ 0.13	$ 0.11	$ 0.02	$ (0.21)	$ (0.25)	$ (0.96)	$ 0.08	$ 0.02	$ 0.05	$ (1.11)	$ (0.40)
Earnings (loss) per share – diluted	$ 0.13	$ 0.11	$ 0.02	$ (0.21)	$ (0.25)	$ (0.96)	$ 0.08	$ 0.02	$ 0.05	$ (1.11)	$ (0.40)

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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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