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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |
Gross Premiums Written | $ (4,041) | $ (11,192) | $ (28,821) | $ (10,130)
Net premiums earned | 41,402 | 60,879 | 94,202 | 126,597
Net Change In Fair Value Of Credit Derivatives | 3,955 | 10,293 | 16,821 | 7,794
Reportable Geographical Components [Member] | United States [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross Premiums Written | (4,675) | (547) | (18,432) | (2,913)
Net premiums earned | 34,632 | 49,710 | 80,746 | 102,448
Net Change In Fair Value Of Credit Derivatives | 238 | 4,724 | 1,094 | 8,681
Reportable Geographical Components [Member] | United Kingdom [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross Premiums Written | 5,404 | (2,139) | 14,755 | 7,035
Net premiums earned | 6,704 | 7,997 | 13,092 | 15,579
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 | (4,770) | (8,506) | (25,144) | (14,252)
Net premiums earned | 66 | 3,172 | 364 | 8,570
Net Change In Fair Value Of Credit Derivatives | $ 3,717 | $ 5,569 | $ 15,727 | $ (887)

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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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