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Fresh Start Financial Statement Reporting - Schedule of Liabilities Subject to Compromise (Detail) (Predecessor Ambac [Member], USD $) In Thousands, unless otherwise specified | Apr. 30, 2013 | Dec. 31, 2012
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Predecessor Ambac [Member] |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |
Debt obligations and accrued interest payable |  | $ 1,690,312
Other |  | 14,592
Consolidated liabilities subject to compromise | 1,704,641 | 1,704,904
Payable to non-debtor subsidiaries |  | 35
Debtor's Liabilities subject to compromise |  | $ 1,704,939

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- Definition Total amount of liabilities subject to compromise. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6585303&loc=d3e56145-112766 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 90-7 -Paragraph 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6918054&loc=d3e56015-112765 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6916575&loc=d3e55717-112764 + Details
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- Definition The amount of debt and related accrued interest included in liabilities subject to compromise. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6585303&loc=d3e56145-112766 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 90-7 -Paragraph 26 -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 Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6918054&loc=d3e56015-112765 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6916575&loc=d3e55717-112764 + Details
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