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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 | Jun. 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 | $ 37,507,047 |  | $ 44,199,767
Insurance Assets | 2,298,884 |  | 1,069,268
Insurance Liabilities | 1,617,125 |  | 4,260,578
Derivative Liabilities | 6,172 |  | 9,745
Variable Interest Entity, Primary Beneficiary [Member] | Global Structured Finance [Member] |  |  |
Variable Interest Entities [Line Items] |  |  |
Maximum Exposure To Loss | 12,611,489 |  | 18,569,951
Insurance Assets | 1,966,733 |  | 733,921
Insurance Liabilities | 1,253,527 |  | 3,889,522
Derivative Liabilities | 7,490 |  | 10,296
Variable Interest Entity, Primary Beneficiary [Member] | Global Public Finance [Member] |  |  |
Variable Interest Entities [Line Items] |  |  |
Maximum Exposure To Loss | 24,895,558 |  | 25,629,816
Insurance Assets | 332,151 |  | 335,347
Insurance Liabilities | 363,598 |  | 371,056
Derivative Liabilities | (1,318) |  | (551)
Variable Interest Entity, Primary Beneficiary [Member] | Collateralized Debt Obligations [Member] | Global Structured Finance [Member] |  |  |
Variable Interest Entities [Line Items] |  |  |
Maximum Exposure To Loss | 26,882 |  | 35,555
Insurance Assets | 108 |  | 169
Insurance Liabilities | 1 |  | 1
Derivative Liabilities | (8) |  | (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 | 7,355,039 |  | 12,766,685
Insurance Assets | 1,862,269 |  | 619,848
Insurance Liabilities | 598,722 |  | 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 | 2,144,354 |  | 2,266,610
Insurance Assets | 21,150 |  | 23,405
Insurance Liabilities | 326,476 |  | 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 | 893,643 |  | 987,797
Insurance Assets | 25,768 |  | 30,413
Insurance Liabilities | 23,508 |  | 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 | 2,191,571 |  | 2,513,304
Insurance Assets | 57,438 |  | 60,086
Insurance Liabilities | 304,820 |  | 306,457
Derivative Liabilities | $ 7,498 |  | $ 10,311

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- Definition SatisfactionAndDischargeOfSegregatedAccountDeferredInterestAmounts + References No definition available. + Details
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- Definition SatisfactionAndDischargeOfSegregatedAccountDeferredPrincipalAmounts + References No definition available. + Details
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- Definition The net carrying amount of derivative assets or liabilities in the reporting entity's statement of financial position that relate to the entity's variable interests in Variable Interest Entities (VIEs) where the VIEs are not consolidated. + References No definition available. + Details
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- Definition The carrying amount of insurance assets in the reporting entity's statement of financial position that relate to the entity's variable interests in Variable Interest Entities (VIEs) where the VIEs are not consolidated. + References No definition available. + Details
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X
- Definition The carrying amount of insurance liabilities in the reporting entity's statement of financial position that relate to the entity's variable interests in Variable Interest Entities (VIEs) where the VIEs are not consolidated. + References No definition available. + Details
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