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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
	Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share [Abstract]
Net income	$ 16,168	$ 13,925
Weighted average common shares outstanding used in basic EPS	43,521	43,252
Common shares issuable upon exercise of dilutive stock options and PSAs / RSUs	350	697
Weighted average common shares outstanding and common share equivalents used in diluted EPS	43,871	43,949
Earnings per share
Basic	$ 0.37	$ 0.32
Diluted	$ 0.37	$ 0.32

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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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