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Schedule II - Condensed Financial Information of Registrant (Parent Company Only) - Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total | $ (20,943) | $ (19,890) | $ (14,719) | $ (3,369) | $ (9,099) | $ (4,595) | $ (8,725) | $ (813) | $ (58,921) | $ (23,232) | $ (35,244)
Adjustments to reconcile net income loss to net cash used in operating activities: |  |  |  |  |  |  |  |  |  |  |
Amortization of bond premium and discount |  |  |  |  |  |  |  |  | (296) | 9 | (6,742)
Net investment gains (losses), including impairments | 4,455 | $ 577 | $ (4,535) | 0 | (1) | $ 0 | $ 20 | (38) | 497 | (19) | 62
Share-based compensation |  |  |  |  |  |  |  |  | 9,356 | 12,266 | 11,231
Proceeds from Contributions from Affiliates |  |  |  |  |  |  |  |  | 10,739 | 8,032 | 5,760
Other, net |  |  |  |  |  |  |  |  | 237 | (7,819) | 37,260
Net Cash Provided by (Used in) Investing Activities [Abstract] |  |  |  |  |  |  |  |  |  |  |
Proceeds from matured bonds |  |  |  |  |  |  |  |  | 21,580 | 15,078 | 18,097
Purchases of bonds |  |  |  |  |  |  |  |  | (60,470) | (33,243) | (43,489)
Change in short-term investments |  |  |  |  |  |  |  |  | 101,829 | 4,157 | (48,386)
Proceeds from Sale and Maturity of Other Investments |  |  |  |  |  |  |  |  | 625 |  |
Other, net |  |  |  |  |  |  |  |  | (3,750) | (4,854) | 2,329
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents at beginning of period |  |  |  | 7,342 |  |  |  | 6,329 | 7,342 | 6,329 |
Cash and cash equivalents end of period | 29,606 |  |  |  | 7,342 |  |  |  | 29,606 | 7,342 | 6,329
Cash paid during the period for: |  |  |  |  |  |  |  |  |  |  |
Income taxes |  |  |  |  |  |  |  |  | 526 | 381 | 347
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  |  |  |  |  |  | 243,776 | 6,953 | 18,442
Payments for Repurchase of Common Stock |  |  |  |  |  |  |  |  | 11,698 | 4,510 | 14,217
Stock Issued During Period, Value, Acquisitions |  |  |  |  |  |  |  |  | 29,229 | 0 | 0
Ambac Financial Group, Inc Parent Company Only [Member] |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total |  |  |  |  |  |  |  |  | (556,449) | 3,632 | 522,380
Adjustments to reconcile net income loss to net cash used in operating activities: |  |  |  |  |  |  |  |  |  |  |
Equity in undistributed net (income) loss of non-debtor subsidiaries |  |  |  |  |  |  |  |  | 526,937 | (15,027) | (541,773)
Amortization of bond premium and discount |  |  |  |  |  |  |  |  | 0 | 0 | (7,378)
Net investment gains (losses), including impairments |  |  |  |  |  |  |  |  | 498 | (55) | 13,664
Decrease in current income taxes payable |  |  |  |  |  |  |  |  | (1,970) | (1,674) | (809)
Share-based compensation |  |  |  |  |  |  |  |  | 8,361 | 9,404 | 11,962
Decrease in other assets |  |  |  |  |  |  |  |  | 7,817 | (4,660) | 40,976
Other, net |  |  |  |  |  |  |  |  | 1,814 | 2,392 | 1,109
Net cash provided by (used in) operating activities |  |  |  |  |  |  |  |  | (1,755) | 2,044 | 45,891
Net Cash Provided by (Used in) Investing Activities [Abstract] |  |  |  |  |  |  |  |  |  |  |
Proceeds from matured bonds |  |  |  |  |  |  |  |  | 5,000 | 0 | 68,205
Purchases of bonds |  |  |  |  |  |  |  |  | 0 | (795) | (750)
Change in short-term investments |  |  |  |  |  |  |  |  | 91,249 | 19,676 | (51,069)
Proceeds from Sale and Maturity of Other Investments |  |  |  |  |  |  |  |  | (1,749) | (2,715) | (4,213)
Net Cash Provided by (Used in) Investing Activities, Total |  |  |  |  |  |  |  |  | 94,500 | 16,166 | 12,173
Capital Contribution to Subsidiaries |  |  |  |  |  |  |  |  | (70,817) | (16,050) | (42,420)
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |
Net Cash Provided by (Used in) Financing Activities |  |  |  |  |  |  |  |  | (82,516) | (20,560) | (56,637)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect |  |  |  |  |  |  |  |  | 9,731 | (2,350) | 1,427
Cash and cash equivalents at beginning of period |  |  |  | $ 250 |  |  |  | $ 2,600 | 250 | 2,600 | 1,173
Cash and cash equivalents end of period | $ 9,981 |  |  |  | $ 250 |  |  |  | 9,981 | 250 | 2,600
Cash paid during the period for: |  |  |  |  |  |  |  |  |  |  |
Income taxes |  |  |  |  |  |  |  |  | 0 | 0 | 0
Payments for Repurchase of Common Stock |  |  |  |  |  |  |  |  | (11,699) | (4,510) | (14,217)
Stock Issued During Period, Value, Acquisitions |  |  |  |  |  |  |  |  | $ 29,229 | $ 0 | $ 0

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