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Earnings Per Share - Details of Basic and Diluted Earnings Per Share (EPS) (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
Earnings Per Share [Abstract]
Net income	$ 12,105	$ 19,601	$ 17,994	$ 37,734
Weighted average common shares outstanding used in basic EPS	43,617	43,576	43,601	43,552
Common shares issuable upon exercise of dilutive stock options and PSAs / RSUs	565	557	809	507
Weighted average common shares outstanding and common share equivalents used in diluted EPS	44,182	44,133	44,410	44,059
Earnings per share
Basic	$ 0.28	$ 0.45	$ 0.41	$ 0.87
Diluted	$ 0.27	$ 0.44	$ 0.41	$ 0.86

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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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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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