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Summary of Companys Income Tax Provision and Effective Income Tax Rate (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Income Taxes [Line Items]
Income before income taxes	$ 86,565	$ 103,820	$ 268,171	$ 281,217
Provision for income taxes	$ 22,194	$ 29,543	$ 73,082	$ 79,345
Effective income tax rate	25.60%	28.50%	27.30%	28.20%

- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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