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Income Taxes - Summary Of Income Tax Provision And Effective Tax Rate For 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 Contingency [Line Items]
Pretax (loss) income	$ (47,506)	$ 20,283	$ (108,374)	$ 210,664
Income tax (benefit) provision	$ (16,675)	$ 6,215	$ (30,109)	$ 72,582
Effective tax rate	35.10%	30.60%	27.80%	34.50%

- 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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