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Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
9 Months Ended | 12 Months Ended | |
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Sep. 30, 2013
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Sep. 30, 2012
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Dec. 31, 2012
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| Income Tax Disclosure [Abstract] | |||
| Decrease in unrecognized tax benefits | $ 0.03 | $ 2.10 | |
| Liabilities for unrecognized tax benefits | 1.3 | ||
| Unrecognized tax benefit, interest accrued net of federal income tax benefits | 0.02 | ||
| Unrecognized tax benefits, penalty | 0.02 | ||
| Reduction of reserve | 0.4 | ||
| Valuation allowance to offset deferred tax asset | $ 3.0 | ||
| 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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- Details
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- Definition
The increase (decrease) during the reporting period in the reserve account established to account for expected but unspecified losses. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of statutory penalties accrued for a tax position claimed or expected to be claimed by the entity, in its tax return. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of interest expense accrued for an underpayment of income taxes. 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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