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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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Numerator
Net Income (Loss)	$ (7,670)	$ 12,401	$ (18,484)	$ 19,052
Denominator
Weighted average number of shares – basic	47,856	48,036	48,043	48,232
Effect of dilutive securities
Stock options		279	8	348
PSUs, RSUs and restricted stock	46	98	40	95
Weighted average number of shares – diluted	47,902	48,413	48,091	48,675
Net income (loss) per share – basic	$ (0.16)	$ 0.26	$ (0.38)	$ 0.40
Net income (loss) per share – diluted	$ (0.16)	$ 0.26	$ (0.38)	$ 0.39

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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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