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Reconciliation of Effective Income Tax Rate (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Schedule Of Effective Tax Rates Line Items
Income before income taxes	$ 62,008	$ 77,181
Provision for income taxes	$ 16,122	$ 22,066
Effective income tax rate	26.00%	28.60%

- 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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