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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		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share [Abstract]
Net income	$ 10,602	$ 12,242	$ 40,806	$ 20,096
Shares of common stock and common stock equivalents:
Weighted averages shares used in basic computation	131,533	125,771	131,235	125,605
Dilutive effect of stock options and unvested restricted stock	6,725	14,310	7,266	14,111
Weighted averages shares used in dilutive computation	138,258	140,081	138,501	139,716
Basic earnings per share	$ 0.08	$ 0.10	$ 0.31	$ 0.16
Dilutive earnings per share	$ 0.08	$ 0.09	$ 0.29	$ 0.14

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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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