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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		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]
Net income	$ 34,119	$ 20,099	$ 50,681	$ 52,409
Weighted average common shares outstanding used in basic EPS	43,251	42,837	43,118	42,814
Common shares issuable upon exercise of dilutive stock options and PSAs / RSUs	1,077	830	1,095	781
Weighted average common shares outstanding and common share equivalents used in diluted EPS	44,328	43,667	44,213	43,595
Earnings per share
Basic	$ 0.79	$ 0.47	$ 1.18	$ 1.22
Diluted	$ 0.77	$ 0.46	$ 1.15	$ 1.20

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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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