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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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Numerator
Net Income	$ 15,898	$ 12,415	$ 34,950	$ 27,657
Denominator
Weighted average number of shares – basic	47,870	48,470	48,110	48,839
Effect of dilutive securities
Stock options	487	137	385	137
PSUs, RSUs and restricted stock	174	71	123	60
Weighted average number of shares – diluted	48,531	48,678	48,618	49,036
Net income per share – basic	$ 0.33	$ 0.26	$ 0.73	$ 0.57
Net income per share – diluted	$ 0.33	$ 0.26	$ 0.72	$ 0.56

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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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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