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Fresh Start Financial Statement Reporting - Schedule of Impact of Fresh Start Adjustments (Detail) (Predecessor Ambac [Member], USD $) In Thousands, unless otherwise specified | Apr. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Fresh-Start Adjustment [Line Items] |  |
Deferred acquisition costs | $ (184,953) | $ (199,160)
Insurance intangible asset | 1,658,972 |
Goodwill | 514,511 |
Obligations under investment agreements | (1,505) |
Long-term debt and accrued interest payable | (767,924) |
Other liabilities | (1,837) |
Asset/liability fair value adjustments impacting Reorganization items | 1,228,251 |
Adjustment to deferred tax provision |  |
Gain on fresh start adjustments | 1,228,251 |
Non Variable Interest Entities [Member] |  |
Fresh-Start Adjustment [Line Items] |  |
Loans (non-VIE) | (1,575) |
Variable Interest Entity [Member] |  |
Fresh-Start Adjustment [Line Items] |  |
VIE loans and long-term debt | $ 12,562 |

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- Definition Fresh-start adjustments to VIE assets and liabilities + References No definition available. + Details
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- Definition Net amount of deferred policy acquisition costs capitalized on contracts remaining in force as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 825 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6487548&loc=d3e32546-158582 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6481648&loc=d3e11198-158413 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),7) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 7 + Details
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- Definition Amount of fresh-start adjustment to amortizable intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=29642632&loc=d3e56426-112766 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6918054&loc=SL2890621-112765 + Details
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- Definition Amount of fresh-start adjustment to goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=29642632&loc=d3e56426-112766 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6918054&loc=SL2890621-112765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 45 -Paragraph 20 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6916575&loc=SL2890583-112764 + Details
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- Definition Amount of fresh-start adjustment to reorganization value in excess of amounts allocable to identifiable assets (generally due to the revaluation of assets and liabilities). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Reorganization Value -URI http://asc.fasb.org/extlink&oid=29635974 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=29642632&loc=d3e56426-112766 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6918054&loc=SL2890621-112765 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 05 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6458260&loc=d3e54813-112758 + Details
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