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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		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Earnings Per Share [Line Items]
Net income	$ 64,465	$ 45,154	$ 125,078	$ 62,998
Basic common shares outstanding	96,432	96,266	96,424	96,432
Stock options, unvested restricted stock and performance units	1,062	1,145	1,037	1,164
Diluted common shares outstanding	97,494	97,411	97,461	97,596
Basic income per common share	$ 0.67	$ 0.47	$ 1.30	$ 0.65
Diluted income per common share	$ 0.66	$ 0.46	$ 1.28	$ 0.65

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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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