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Segment Information - Schedule of Gross Premiums Written, Net Premiums Earned and Net Change in Fair Value of Credit Derivatives (Detail) - Successor [Member] - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Segment Reporting Information [Line Items] |  |  |  |
Gross Premiums Written | $ (8,710) | $ (13,700) | $ (18,840) | $ (64,952)
Net premiums earned | 71,535 | 64,831 | 198,132 | 212,391
Net Change In Fair Value Of Credit Derivatives | 36,952 | 7,416 | 44,746 | 13,579
Reportable Geographical Components [Member] | United States [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross Premiums Written | (2,386) | (15,355) | (5,172) | (44,266)
Net premiums earned | 60,402 | 44,882 | 163,094 | 141,472
Net Change In Fair Value Of Credit Derivatives | 30,604 | 262 | 39,286 | 6,283
Reportable Geographical Components [Member] | United Kingdom [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross Premiums Written | 260 | 1,482 | 7,295 | (1,681)
Net premiums earned | 8,081 | 14,309 | 23,659 | 55,752
Net Change In Fair Value Of Credit Derivatives | 0 | 0 | 0 | 0
Reportable Geographical Components [Member] | Other International [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross Premiums Written | (6,584) | 173 | (20,963) | (19,005)
Net premiums earned | 3,052 | 5,640 | 11,379 | 15,167
Net Change In Fair Value Of Credit Derivatives | $ 6,348 | $ 7,154 | $ 5,460 | $ 7,296

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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=56946850&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 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6811-158387 Reference 2: 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 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 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6816-158387 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 605 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + 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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