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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
	Mar. 31, 2019	Mar. 31, 2018
Numerator
Net Income (Loss)	$ 770	$ (10,814)
Denominator
Weighted average number of shares – basic	47,782	48,232
Effect of dilutive securities
PSUs, RSUs and restricted stock	71
Weighted average number of shares – diluted	47,853	48,232
Earnings (loss) per share – basic	$ 0.02	$ (0.22)
Earnings (loss) per share – diluted	$ 0.02	$ (0.22)

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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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