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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		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Income Taxes [Line Items]
Income before income taxes	$ 104,425	$ 94,959	$ 181,606	$ 177,397
Provision for income taxes	$ 28,822	$ 27,263	$ 50,888	$ 49,802
Effective income tax rate	27.60%	28.70%	28.00%	28.10%

- 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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