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Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
9 Months Ended | ||
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Sep. 30, 2012
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Sep. 30, 2011
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Dec. 31, 2011
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| Income Taxes [Line Items] | |||
| Increase in unrecognized tax benefits | $ (2.1) | $ 0.3 | |
| Liabilities for unrecognized tax benefits | 3.9 | ||
| Unrecognized tax benefit, interest accrued net of federal income tax benefits | 0.1 | ||
| Unrecognized tax benefits, penalty | 0.02 | ||
| Valuation allowance to offset deferred tax asset | $ 0.2 | ||
| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
This element represents the amount of statutory penalties accrued as of the date of the statement of financial position for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
This element represents the amount of interest expense accrued as of the date of the statement of financial position for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The net amount of all increases and decreases in unrecognized tax benefits for the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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