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Schedule II - Condensed Financial Information of Registrant (Parent Company Only) - Condensed Balance Sheet (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | May. 01, 2013 | Apr. 30, 2013
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |
Tolling Payment Payable to AFG | $ 70,911 |  |  |  |
Assets: |  |  |  |  |
Junior surplus note of Ambac Assurance Segregated Account |  |  |  | $ 350,000 | $ 350,000
Total assets |  |  |  |  | 28,853,435
Liabilities: |  |  |  |  |
Total liabilities |  |  |  |  | 28,393,020
Stockholders' equity (deficit): |  |  |  |  |
Common stock |  |  |  |  | 450
Additional paid-in capital |  |  |  |  | 184,550
Successor [Member] |  |  |  |  |
Assets: |  |  |  |  |
Available-for-sale Securities, Debt Securities | 5,043,776 | $ 4,725,686 |  |  |
Other investments | 310,600 | 357,016 |  |  |
Total investments | 5,644,720 | 5,507,034 |  |  | 6,457,264
Cash |  |  |  |  | 152,951
Investment income due and accrued | 25,264 | 25,015 |  |  | 37,961
Other assets | 185,877 | 186,985 |  |  | 54,821
Total assets | 23,728,070 | 25,159,864 | $ 27,092,477 |  | 28,853,435
Liabilities: |  |  |  |  |
Current taxes | 5,835 | 5,701 |  |  | 0
Total liabilities | 21,769,724 | 23,486,129 |  |  | 28,393,020
Stockholders' equity (deficit): |  |  |  |  |
Preferred stock | 0 | 0 |  |  | 0
Common stock | 450 | 450 |  |  | 450
Additional paid-in capital | 190,813 | 189,138 |  |  |
Accumulated other comprehensive income | 15,215 | 220,283 | $ 11,661 |  | 0
Retained earnings (accumulated deficit) | 1,478,439 | 989,290 |  |  | 0
Common stock held in treasury at cost | (118) | (56) |  |  | 0
Total Ambac Financial Group, Inc. stockholders’ equity | 1,684,799 | 1,399,105 |  |  | 185,000
Total liabilities and stockholders’ equity | 23,728,070 | 25,159,864 |  |  | 28,853,435
Predecessor [Member] |  |  |  |  |
Assets: |  |  |  |  |
Total investments |  |  |  |  | 6,457,264
Cash |  |  |  |  | 254,851
Investment income due and accrued |  |  |  |  | 37,961
Other assets |  |  |  |  | 54,821
Total assets |  |  |  |  | 28,853,435
Liabilities: |  |  |  |  |
Current taxes |  |  |  |  | 97,490
Total liabilities |  |  |  |  | 29,444,265
Stockholders' equity (deficit): |  |  |  |  |
Preferred stock |  |  |  |  | 0
Accumulated other comprehensive income |  |  |  |  | 800,260
Retained earnings (accumulated deficit) |  |  |  |  | (5,697,961)
Common stock held in treasury at cost |  |  |  |  | $ 410,695
Ambac Financial Group, Inc Parent Company Only [Member] | Successor [Member] |  |  |  |  |
Assets: |  |  |  |  |
Available-for-sale Securities, Debt Securities | 187,979 | 234,310 |  |  |
Short-term investments, at cost (approximates fair value) | 48,079 | 22,936 |  |  |
Other investments | 25,339 | 21,003 |  |  |
Total investments | 261,397 | 278,249 |  |  |
Cash | 25 | 141 |  |  |
Investment in subsidiaries | 1,349,483 | 1,116,044 |  |  |
Investment income due and accrued | 123 | 54 |  |  |
Related Party Tax Expense, Due from Affiliates, Current | 70,848 |  |  |  |
Other assets | 4,778 | 5,770 |  |  |
Total assets | 1,686,654 | 1,400,258 |  |  |
Liabilities: |  |  |  |  |
Current taxes | 0 | 221 |  |  |
Accounts payable and other liabilities | 1,855 | 932 |  |  |
Total liabilities | 1,855 | 1,153 |  |  |
Stockholders' equity (deficit): |  |  |  |  |
Preferred stock | 0 | 0 |  |  |
Common stock | 450 | 450 |  |  |
Additional paid-in capital | 190,813 | 189,138 |  |  |
Accumulated other comprehensive income | 15,215 | 220,283 |  |  |
Retained earnings (accumulated deficit) | 1,478,439 | 989,290 |  |  |
Common stock held in treasury at cost | (118) | (56) |  |  |
Total Ambac Financial Group, Inc. stockholders’ equity | 1,684,799 | 1,399,105 |  |  |
Total liabilities and stockholders’ equity | $ 1,686,654 | $ 1,400,258 |  |  |

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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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- Definition Sum of the carrying values as of the balance sheet date of liabilities incurred and payable to vendors for goods and services received, and other costs not separately disclosed in the balance sheet that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. + References No definition available. + Details
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