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Earnings Per Share - Reconciliation of Basic and Diluted Earnings Per Share (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 Diluted Other Disclosures [Abstract]
Net income	$ 14,965	$ 4,533	$ 35,061	$ 5,777
Shares of common stock and common stock equivalents:
Weighted averages shares used in basic computation	126,509	123,214	125,909	121,445
Dilutive effect of stock options and unvested restricted stock	13,588	15,244	13,896	16,433
Weighted averages shares used in dilutive computation	140,097	138,458	139,805	137,878
Basic earnings per share	$ 0.12	$ 0.04	$ 0.28	$ 0.05
Dilutive earnings per share	$ 0.11	$ 0.03	$ 0.25	$ 0.04

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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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