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Accounting for Uncertainty in Income Taxes - Additional Information (Detail) (USD $)
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9 Months Ended | 12 Months Ended | ||
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Sep. 30, 2013
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Dec. 31, 2012
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Sep. 30, 2012
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Dec. 31, 2011
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| Income Tax Disclosure [Line Items] | ||||
| Liability for unrecognized tax | $ 10,500,000 | $ (10,030,000) | $ 12,000,000 | $ (15,492,000) |
| Unrecognized tax favorable impact on effective tax rate | 3,800,000 | 3,200,000 | 5,200,000 | |
| Accrued interest and penalties applied to uncertain tax positions | $ 7,700,000 | $ 7,000,000 |
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- Details
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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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- Definition
This element represents the total of interest expense recognized 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 and the amount of statutory penalties in the period in which the entity claims or expects to claim a tax position, 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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- Definition
The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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