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Segment Information - Schedule of Gross Premiums Written, Net Premiums Earned and Net Change in Fair Value of Credit Derivatives (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2014 Successor Ambac [Member] | Mar. 31, 2014 Successor Ambac [Member] Reportable Geographical Components [Member] United States [Member] | Mar. 31, 2014 Successor Ambac [Member] Reportable Geographical Components [Member] United Kingdom [Member] | Mar. 31, 2014 Successor Ambac [Member] Reportable Geographical Components [Member] Other International [Member] | Mar. 31, 2013 Predecessor Ambac [Member] | Mar. 31, 2013 Predecessor Ambac [Member] Reportable Geographical Components [Member] United States [Member] | Mar. 31, 2013 Predecessor Ambac [Member] Reportable Geographical Components [Member] United Kingdom [Member] | Mar. 31, 2013 Predecessor Ambac [Member] Reportable Geographical Components [Member] Other International [Member]
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Gross Premiums Written | $ (5,766) | $ (699) | $ (6,166) | $ 1,099 | $ (3,530) | $ (8,716) | $ 8,507 | $ (3,321)
Net premiums earned | 82,547 | 56,758 | 20,635 | 5,154 | 100,256 | 81,057 | 13,754 | 5,445
Net Change In Fair Value Of Credit Derivatives | $ 7,382 | $ 6,581 | $ 0 | $ 801 | $ 12,787 | $ 16,530 | $ (2,175) | $ (1,568)

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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 + Details
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- Definition Amount, after premiums ceded to other entities and premiums assumed by the entity, of financial guarantee premiums earned. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1 -Article 7 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6486662&loc=d3e27175-158546 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6933001&loc=SL5747862-161289 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6811-158387 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6816-158387 + Details
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- Definition Amount of direct and assumed premiums written. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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