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Special Purpose Entities, Including Variable Interest Entities - Summary of Carrying Amount of Assets, Liabilities and Maximum Exposure to Loss of Ambac's Variable Interests in Non-Consolidated Variable Interest Entities (Detail) - Successor [Member] - USD ($)
$ in Thousands
Sep. 30, 2018
Feb. 12, 2018
Dec. 31, 2017
Variable Interest Entities [Line Items]      
SatisfactionAndDischargeOfSegregatedAccountDeferredPrincipalAmounts   $ 3,000,158  
SatisfactionAndDischargeOfSegregatedAccountDeferredInterestAmounts   $ 856,834  
Variable Interest Entity, Primary Beneficiary [Member]      
Variable Interest Entities [Line Items]      
Maximum Exposure To Loss $ 36,511,389   $ 44,199,767
Insurance Assets 2,240,304   1,069,268
Insurance Liabilities 1,462,591   4,260,578
Derivative Liabilities 4,873   9,745
Variable Interest Entity, Primary Beneficiary [Member] | Global Structured Finance [Member]      
Variable Interest Entities [Line Items]      
Maximum Exposure To Loss 11,959,969   18,569,951
Insurance Assets 1,924,726   733,921
Insurance Liabilities 1,117,283   3,889,522
Derivative Liabilities 6,043   10,296
Variable Interest Entity, Primary Beneficiary [Member] | Global Public Finance [Member]      
Variable Interest Entities [Line Items]      
Maximum Exposure To Loss 24,551,420   25,629,816
Insurance Assets 315,578   335,347
Insurance Liabilities 345,308   371,056
Derivative Liabilities (1,170)   (551)
Variable Interest Entity, Primary Beneficiary [Member] | Collateralized Debt Obligations [Member] | Global Structured Finance [Member]      
Variable Interest Entities [Line Items]      
Maximum Exposure To Loss 14,554   35,555
Insurance Assets 0   169
Insurance Liabilities 0   1
Derivative Liabilities (5)   (15)
Variable Interest Entity, Primary Beneficiary [Member] | Residential Mortgage-Backed Securities [Member] | Global Structured Finance [Member]      
Variable Interest Entities [Line Items]      
Maximum Exposure To Loss 6,992,810   12,766,685
Insurance Assets 1,827,464   619,848
Insurance Liabilities 555,122   3,218,356
Variable Interest Entity, Primary Beneficiary [Member] | Other Consumer Asset-Backed [Member] | Global Structured Finance [Member]      
Variable Interest Entities [Line Items]      
Maximum Exposure To Loss 1,745,767   2,266,610
Insurance Assets 16,349   23,405
Insurance Liabilities 245,775   328,732
Derivative Liabilities 0   0
Variable Interest Entity, Primary Beneficiary [Member] | Other Commercial Asset-Backed [Member] | Global Structured Finance [Member]      
Variable Interest Entities [Line Items]      
Maximum Exposure To Loss 1,025,429   987,797
Insurance Assets 25,397   30,413
Insurance Liabilities 17,248   35,976
Derivative Liabilities 0   0
Variable Interest Entity, Primary Beneficiary [Member] | Other [Member] | Global Structured Finance [Member]      
Variable Interest Entities [Line Items]      
Maximum Exposure To Loss 2,181,409   2,513,304
Insurance Assets 55,516   60,086
Insurance Liabilities 299,138   306,457
Derivative Liabilities $ 6,048   $ 10,311