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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 | 5 Months Ended | 9 Months Ended | 3 Months Ended | 5 Months Ended | 9 Months Ended | 3 Months Ended | 5 Months Ended | 9 Months Ended | 3 Months Ended | 5 Months Ended | 9 Months Ended | 4 Months Ended
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Sep. 30, 2014 Successor Ambac [Member] | Sep. 30, 2013 Successor Ambac [Member] | Sep. 30, 2013 Successor Ambac [Member] | Sep. 30, 2014 Successor Ambac [Member] | Sep. 30, 2014 Successor Ambac [Member] Reportable Geographical Components [Member] United States [Member] | Sep. 30, 2013 Successor Ambac [Member] Reportable Geographical Components [Member] United States [Member] | Sep. 30, 2013 Successor Ambac [Member] Reportable Geographical Components [Member] United States [Member] | Sep. 30, 2014 Successor Ambac [Member] Reportable Geographical Components [Member] United States [Member] | Sep. 30, 2014 Successor Ambac [Member] Reportable Geographical Components [Member] United Kingdom [Member] | Sep. 30, 2013 Successor Ambac [Member] Reportable Geographical Components [Member] United Kingdom [Member] | Sep. 30, 2013 Successor Ambac [Member] Reportable Geographical Components [Member] United Kingdom [Member] | Sep. 30, 2014 Successor Ambac [Member] Reportable Geographical Components [Member] United Kingdom [Member] | Sep. 30, 2014 Successor Ambac [Member] Reportable Geographical Components [Member] Other International [Member] | Sep. 30, 2013 Successor Ambac [Member] Reportable Geographical Components [Member] Other International [Member] | Sep. 30, 2013 Successor Ambac [Member] Reportable Geographical Components [Member] Other International [Member] | Sep. 30, 2014 Successor Ambac [Member] Reportable Geographical Components [Member] Other International [Member] | Apr. 30, 2013 Predecessor Ambac [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Reportable Geographical Components [Member] United States [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Reportable Geographical Components [Member] United Kingdom [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Reportable Geographical Components [Member] Other International [Member]
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Premiums Written | $ (13,700) | $ (34,380) | $ (68,461) | $ (64,952) | $ (15,355) | $ (25,030) | $ (49,523) | $ (44,266) | $ 1,482 | $ (2,789) | $ (4,706) | $ (1,681) | $ 173 | $ (6,561) | $ (14,232) | $ (19,005) | $ (14,125) | $ (16,102) | $ 10,673 | $ (8,696)
Net premiums earned | 64,831 | 70,949 | 128,988 | 212,391 | 44,882 | 50,234 | 96,574 | 141,472 | 14,309 | 15,273 | 24,113 | 55,752 | 5,640 | 5,442 | 8,301 | 15,167 | 130,000 | 104,594 | 18,071 | 7,335
Net Change In Fair Value Of Credit Derivatives | $ 7,416 | $ 31,194 | $ 82,414 | $ 13,579 | $ 262 | $ 21,911 | $ 36,860 | $ 6,283 | $ 0 | $ 948 | $ 3,061 | $ 0 | $ 7,154 | $ 8,335 | $ 42,493 | $ 7,296 | $ (60,384) | $ (31,134) | $ (5,861) | $ (23,389)

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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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