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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	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Earnings Per Share [Abstract]
Net income	$ 51,537	$ 11,030	$ 3,092
Shares of common stock and common stock equivalents:
Weighted averages shares used in basic computation	126,651	122,138	114,132
Dilutive effect of stock options and unvested restricted stock	13,146	15,830	21,407
Weighted averages shares used in dilutive computation	139,797	137,968	135,539
Basic earnings per share	$ 0.41	$ 0.09	$ 0.03
Dilutive earnings per share	$ 0.37	$ 0.08	$ 0.02

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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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