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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) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Variable Interest Entities [Line Items] |  |
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | $ 5,351 | $ 6,594
Fixed income securities, amortized cost | 289,712 | 341,685
Collateralized Debt Obligations [Member] |  |
Variable Interest Entities [Line Items] |  |
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 2 | 0
Fixed income securities, amortized cost | 3,131 | 0
Residential Mortgage-Backed Securities [Member] |  |
Variable Interest Entities [Line Items] |  |
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 29 | 0
Fixed income securities, amortized cost | 2,475 | 0
Municipal Bonds [Member] |  |
Variable Interest Entities [Line Items] |  |
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 570 | 696
Fixed income securities, amortized cost | $ 14,646 | $ 9,394

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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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