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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, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Earnings Per Share [Line Items]
Net income	$ 39,791	$ 41,777	$ 102,789	$ 118,562
Basic common shares outstanding	96,360	99,020	96,408	99,945
Stock options and unvested restricted stock	989	1,010	1,112	1,085
Diluted common shares outstanding	97,349	100,030	97,520	101,030
Basic income per common share	$ 0.41	$ 0.42	$ 1.07	$ 1.19
Diluted income per common share	$ 0.41	$ 0.42	$ 1.05	$ 1.17

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