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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, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]
Net income	$ 10,623	$ 14,965	$ 51,429	$ 35,061
Shares of common stock and common stock equivalents:
Weighted averages shares used in basic computation	131,778	126,509	131,418	125,909
Dilutive effect of stock options and unvested restricted stock	6,568	13,588	7,058	13,896
Weighted averages shares used in dilutive computation	138,346	140,097	138,476	139,805
Basic earnings per share	$ 0.08	$ 0.12	$ 0.39	$ 0.28
Dilutive earnings per share	$ 0.08	$ 0.11	$ 0.37	$ 0.25

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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- Definition

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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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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