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Components of Income Tax Expense Benefit (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2010
Components Of Income Tax Expense Benefit [Line Items]
Tax benefit from an NOL carryforward	$ 9.6

Amount of an unrecognized tax benefit that is directly related to a position taken in a tax year that results in a net operating loss carryforward. This amount is presented as a reduction of the related deferred tax asset in the balance sheet if that deferred tax asset is not used. This amount is presented separately from the deferred tax asset for a net operating loss carryforward if this unrelated tax benefit is associated with a different tax position.

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