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Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Sep. 30, 2012 | Dec. 31, 2010
Operating Loss Carryforwards [Line Items] |  |
Loss carry-forwards exceed |  | $ 3,400,000
Percentage of payment to IRS, Tier C | 12.50% |
Percentage of payment to IRS, Tier D | 17.50% |
Cash payment to settle tax years | 2,000 |
Forfeiture amount over payment | 1,234 |
Valuation Allowance | 3,349,056 |
Expiration period | Expiring in 2028 and will fully expire in 2032 |
Operating tax carryforward expiration Year start | 2028 |
Operating tax carryforward expiration Year End | 2032 |
Federal Tax Authority [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Net operating tax carry forward | 7,435,696 |
Ambac Assurance [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Potential payment to outstanding disputes | 100,000 |
Ambac [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Potential payment to outstanding disputes | $ 1,900 |

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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43-49 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 17 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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