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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
	Mar. 31, 2013	Mar. 31, 2012
Earnings Per Share [Line Items]
Net income	$ 60,613	$ 17,844
Basic common shares outstanding	96,415	96,598
Stock options and unvested restricted stock	1,001	1,131
Diluted common shares outstanding	97,416	97,729
Basic income per common share	$ 0.63	$ 0.18
Diluted income per common share	$ 0.62	$ 0.18

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