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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Income Taxes [Line Items]
Loss carryforward, federal		$ 457
Loss carryforward, state		80
Increase in liability for uncertain tax positions	18
Deferred tax assets valuation allowance decreased	16
Long term liability relating to uncertain tax positions recognized	2
Federal \| Minimum
Income Taxes [Line Items]
Estimated operating loss carry forwards	300
State
Income Taxes [Line Items]
Estimated operating loss carry forwards	$ 0

- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards.

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards.

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- Definition

The amount of the change in the period in the valuation allowance for a specified deferred tax asset.

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