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Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2009 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2008
Income Taxes [Line Items] |  |  |  |  |  |
Net deferred tax (Liabilities) assets |  | $ (169) | $ (120) | $ 863 |  |
Valuation allowance |  | 5,244 | 5,078 | 9,301 |  |
Change in valuation allowance |  |  | 4,223 |  |  |
Received refund from the IRS | 40,418 |  |  |  |  |
Amount of refund claim up to which IRS examination team is required by statute to review all refund |  |  |  |  | 2,000 |
Adjustment to Taxable Income |  |  |  |  | 13,700 |
Taxes owed |  |  |  |  | 4,806 |
Accrued interest |  | 542 |  |  |  |
Income tax expense |  | 5,348 |  |  |  |
Tax and interest |  |  |  |  |  | 1,400
Tax and interest accrued |  | 800 |  |  |  |
Reversal of Income Tax Receivable |  |  |  | 2,200 |  |
Recognized tax expenses |  |  |  | 1,400 |  |
Reversal of receivable |  |  |  | 1,400 |  |
Reversal of prior tax expense |  |  |  | 2,200 |  |
Reversal of tax benefit accrual |  |  |  | $ 800 |  |

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- Definition The sum of the amounts of estimated penalties and interest recognized in the period arising from income tax examinations. + References No definition available. + Details
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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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