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Schedule II - Condensed Financial Information of Registrant (Parent Company Only) - Condensed Balance Sheet (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | May 01, 2013
--- | --- | --- | --- | --- | ---
Assets: |  |  |  |  |
Debt Securities, Available-for-sale | $ 3,546,006 |  |  |  |
Junior surplus note of Ambac Assurance Segregated Account |  |  |  |  | $ 350,000
Short-term investments, at cost (approximates fair value) | 3,451,149 | $ 5,271,818 |  |  |
Other Investments | 391,217 | 431,630 |  |  |
Total investments | 3,937,223 | 5,740,791 |  |  |
Investment income due and accrued | 11,576 | 16,532 |  |  |
Other assets | 112,788 | 46,614 |  |  |
Total assets | 14,588,711 | 23,192,374 |  |  |
Tolling Payment Payable to AFG | 44,381 | 30,496 |  |  |
Liabilities: |  |  |  |  |
Total liabilities | 12,955,564 | 21,547,116 |  |  |
Stockholders' equity (deficit): |  |  |  |  |
Preferred stock | 0 | 0 |  |  |
Common stock | 454 | 453 |  |  |
Additional paid-in capital | 219,429 | 199,560 |  |  |
Accumulated other comprehensive income (loss) | (48,715) | (52,239) | $ (38,990) |  |
Retained earnings | 1,421,302 | 1,233,845 |  |  |
Common stock held in treasury at cost | (473) | (471) |  |  |
Total Ambac Financial Group, Inc. stockholders’ equity | 1,591,997 | 1,381,148 |  |  |
Total liabilities and stockholders’ equity | 14,588,711 | 23,192,374 |  |  |
Ambac Financial Group, Inc Parent Company Only [Member] |  |  |  |  |
Assets: |  |  |  |  |
Short-term investments, at cost (approximates fair value) | 151,007 | 239,476 |  |  |
Other Investments | 40,168 | 64,691 |  |  |
Total investments | 381,358 | 364,277 |  |  |
Cash | 14,942 | 3,949 |  |  |
Investment in subsidiaries | 1,147,883 | 968,392 |  |  |
Investment income due and accrued | 820 | 329 |  |  |
Current taxes receivable | 44,353 | 29,576 |  |  |
Other assets | 3,205 | 14,946 |  |  |
Total assets | 1,592,561 | 1,381,469 |  |  |
Liabilities: |  |  |  |  |
Accounts payable and other liabilities | 564 | 321 |  |  |
Total liabilities | 564 | 321 |  |  |
Stockholders' equity (deficit): |  |  |  |  |
Preferred stock | 0 | 0 |  |  |
Common stock | 454 | 453 |  |  |
Additional paid-in capital | 219,429 | 199,560 |  |  |
Accumulated other comprehensive income (loss) | (48,715) | (52,239) |  |  |
Retained earnings | 1,421,302 | 1,233,845 |  |  |
Common stock held in treasury at cost | (473) | (471) |  |  |
Total Ambac Financial Group, Inc. stockholders’ equity | 1,591,997 | 1,381,148 | $ 1,713,914 | $ 1,684,799 |
Total liabilities and stockholders’ equity | 1,592,561 | 1,381,469 |  |  |
Short-term Investments [Member] |  |  |  |  |
Assets: |  |  |  |  |
Debt Securities, Available-for-sale | 430,331 | 557,270 |  |  |
Short-term investments, at cost (approximates fair value) | 430,405 | 557,476 |  |  |
Short-term Investments [Member] | Ambac Financial Group, Inc Parent Company Only [Member] |  |  |  |  |
Assets: |  |  |  |  |
Short-term investments, at cost (approximates fair value) | 192,996 | 69,531 |  |  |
Fixed Income Securities [Member] |  |  |  |  |
Assets: |  |  |  |  |
Debt Securities, Available-for-sale | 3,115,675 | 4,652,172 |  |  |
Short-term investments, at cost (approximates fair value) | 3,020,744 | 4,614,623 |  |  |
Fixed Income Securities [Member] | Ambac Financial Group, Inc Parent Company Only [Member] |  |  |  |  |
Assets: |  |  |  |  |
Debt Securities, Available-for-sale | $ 148,194 | $ 230,055 |  |  |

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- Definition Junior Surplus Notes issued by the Segregated Account of Ambac Assurance to Ambac upon Ambac's emergence from bankruptcy. These Junior Surplus notes will be includable in surplus for statutory accounting purposes as prescribed or permitted by state laws and regulations. + References No definition available. + Details
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