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Schedule Of Effective Tax Rates Calculation (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule Of Effective Tax Rates Line Items
Provision for income taxes	$ 274,616	$ 247,466	$ 152,302
Income before income taxes	$ 763,663	$ 696,336	$ 428,097
Effective tax rate	36.00%	35.50%	35.60%

- 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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