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Financial Guarantee Insurance Contracts - Effect of Reinsurance on Premiums Written and Earned (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 5 Months Ended | 3 Months Ended | 4 Months Ended | 9 Months Ended
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Sep. 30, 2013 Successor Ambac [Member] | Sep. 30, 2013 Successor Ambac [Member] | Sep. 30, 2012 Predecessor Ambac [Member] | Apr. 30, 2013 Predecessor Ambac [Member] | Sep. 30, 2012 Predecessor Ambac [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |  |  |  |
Direct Premiums Written | $ (34,380) | $ (68,461) | $ (55,310) | $ (14,125) | $ (175,777)
Assumed Reinsurance Premiums Written |  |  |  |  |
Ceded Reinsurance Premiums Written | (4,017) | (7,055) | (2,082) | (1,098) | (18,055)
Premiums written, net of reinsurance | (30,363) | (61,406) | (53,228) | (13,027) | (157,722)
Direct Premiums Earned | 73,997 | 136,029 | 117,864 | 138,468 | 323,658
Assumed Reinsurance Premiums Earned | 24 | 40 | 25 | 32 | 118
Ceded Reinsurance Premiums Earned | 3,072 | 7,081 | 4,815 | 8,500 | 12,710
Reinsurance on premiums earned, Net | $ 70,949 | $ 128,988 | $ 113,074 | $ 130,000 | $ 311,066

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- Definition Amount of earned premiums assumed from other entities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574992-122915 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.1) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b),(c)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1 -Article 7 + Details
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- Definition Amount of written premiums ceded to other entities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b),(c)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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