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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, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |
Gross Premiums Written | $ (10,543) | $ (8,710) | $ (39,364) | $ (18,840)
Net premiums earned | 53,218 | 71,535 | 147,420 | 198,132
Net Change In Fair Value Of Credit Derivatives | 1,733 | 36,952 | 18,554 | 44,746
Reportable Geographical Components [Member] | United States [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross Premiums Written | (7,555) | (2,386) | (25,988) | (5,172)
Net premiums earned | 45,257 | 60,402 | 126,003 | 163,094
Net Change In Fair Value Of Credit Derivatives | 520 | 30,604 | 1,613 | 39,286
Reportable Geographical Components [Member] | United Kingdom [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross Premiums Written | (598) | 260 | 14,157 | 7,295
Net premiums earned | 6,018 | 8,081 | 19,111 | 23,659
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 | (2,390) | (6,584) | (27,533) | (20,963)
Net premiums earned | 1,943 | 3,052 | 2,306 | 11,379
Net Change In Fair Value Of Credit Derivatives | $ 1,213 | $ 6,348 | $ 16,941 | $ 5,460

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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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