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Income Taxes - Income Tax (Benefit) Expense from Continuing Operations (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 Tax Expense Benefit [Line Items]
Income tax (benefit) expense	$ (29,074)	$ 22,540	$ (17,910)	$ 35,346
Effective tax rate	35.10%	40.40%	30.90%	43.70%

- 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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