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Computation of Basic and Diluted Income Per Common 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 [Line Items]
Net income	$ 84,180	$ 39,791	$ 209,258	$ 102,789
Basic common shares outstanding	96,758	96,360	96,536	96,408
Stock options, unvested restricted stock and performance units	839	989	976	1,112
Diluted common shares outstanding	97,597	97,349	97,512	97,520
Basic income per common share	$ 0.87	$ 0.41	$ 2.17	$ 1.07
Diluted income per common share	$ 0.86	$ 0.41	$ 2.15	$ 1.05

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