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Earnings Per Share - Details of Basic and Diluted Earnings Per Share (EPS) (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Earnings Per Share [Abstract]
Net income	$ 14,648	$ 15,629
Weighted average common shares outstanding used in basic EPS	43,366	42,966
Common shares issuable upon exercise of dilutive stock options and PSAs / RSUs	994	955
Weighted average common shares outstanding and common share equivalents used in diluted EPS	44,360	43,921
Earnings per share
Basic	$ 0.34	$ 0.36
Diluted	$ 0.33	$ 0.36

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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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