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Schedule IV - Reinsurance (Detail) (USD $) In Thousands, unless otherwise specified | 8 Months Ended | 4 Months Ended | 12 Months Ended | 8 Months Ended | 4 Months Ended | 12 Months Ended
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Dec. 31, 2013 Successor Ambac [Member] | Apr. 30, 2013 Predecessor Ambac [Member] | Dec. 31, 2012 Predecessor Ambac [Member] | Dec. 31, 2013 Financial Guarantee Insurance Corporation [Member] Successor Ambac [Member] | Apr. 30, 2013 Financial Guarantee Insurance Corporation [Member] Predecessor Ambac [Member] | Dec. 31, 2012 Financial Guarantee Insurance Corporation [Member] Predecessor Ambac [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |  |  |  |  |
Gross Amount | $ (80,309) | $ (14,125) | $ (277,508) | $ (80,309) | $ (14,125) | $ (277,508)
Ceded to Other Companies | (7,810) | (1,098) | (23,371) | (7,810) | (1,098) | (23,371)
Assumed from Other Companies |  |  |  |  |  |
Net Amount | $ (72,499) | $ (13,027) | $ (254,137) | $ (72,499) | $ (13,027) | $ (254,137)
Percentage of Amount Assumed to Net |  |  |  |  |  |

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- Definition Amount of written premiums assumed from other entities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b)(2),(c)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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- Definition Amount, before premiums ceded to other entities and premiums assumed by the entity, of premiums written. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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- Definition Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums written. + 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) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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