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Earnings Per Share - Summary of Calculation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Numerator
Net Income (Loss)	$ 7,589	$ 15,898	$ (10,895)	$ 34,950
Denominator
Weighted average number of shares – basic	47,710	47,870	47,927	48,110
Effect of dilutive securities
Stock options	27	487		385
PSUs, RSUs and restricted stock	97	174		123
Weighted average number of shares – diluted	47,834	48,531	47,927	48,618
Net income (loss) per share – basic	$ 0.16	$ 0.33	$ (0.23)	$ 0.73
Net income (loss) per share – diluted	$ 0.16	$ 0.33	$ (0.23)	$ 0.72

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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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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of contingently issuable shares. Contingently issuable shares are those shares that are issuable for little or no cash contingent on certain conditions being met.

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