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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								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Numerator
Net Income	$ (11,110)	$ 15,898	$ 12,401	$ 6,651	$ 7,572	$ 12,415	$ 10,228	$ 5,014	$ 23,840	$ 35,229	$ 18,646
Denominator
Weighted average number of shares – basic									48,153	48,724	51,145
Effect of dilutive securities:
Stock options									406	170	81
Restricted stock and restricted stock units									140	55	41
Weighted average number of shares – diluted									48,699	48,949	51,267
Net income per share – basic	$ (0.23)	$ 0.33	$ 0.26	$ 0.14	$ 0.16	$ 0.26	$ 0.21	$ 0.10	$ 0.50	$ 0.72	$ 0.36
Net income per share – diluted	$ (0.23)	$ 0.33	$ 0.26	$ 0.14	$ 0.16	$ 0.26	$ 0.21	$ 0.10	$ 0.49	$ 0.72	$ 0.36

X

- Definition

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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units 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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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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