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Schedule II - Condensed Financial Information of Registrant (Parent Company Only) - Condensed Balance Sheet (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | --- | ---
Assets: |  |  |
Short-term investments, at cost (approximates fair value) | $ 661,219 | $ 783,015 |
Cash | 43,837 | 15,999 |
Restricted cash |  | 2,500 |
Other assets | 39,715 | 104,300 |
Total assets | 27,007,164 | 27,113,695 |
Liabilities: |  |  |
Liabilities subject to compromise | 1,704,904 | 1,707,421 |
Current taxes | 96,778 | 95,709 |
Total liabilities | 30,254,131 | 30,263,228 |
Stockholders' deficit: |  |  |
Preferred stock, par value $0.01 per share; authorized shares-4,000,000; issued and outstanding shares-none |  |  |
Common stock, par value $0.01 per share; authorized shares-650,000,000 at December 31, 2012 and 2011; issued and outstanding shares-308,016,764 at December 31, 2012 and 2011 | 3,080 | 3,080 |
Additional paid-in capital | 2,172,027 | 2,172,027 |
Accumulated other comprehensive income | 625,385 | 463,259 |
Accumulated deficit | (6,297,264) | (6,039,922) |
Common stock held in treasury at cost, 5,580,657 shares at December 31, 2012 and 5,587,953 shares at December 31, 2011 | (410,755) | (411,419) |
Total Ambac Financial Group, Inc. stockholders' deficit | (3,907,527) | (3,812,975) |
Total liabilities and stockholders' deficit | 27,007,164 | 27,113,695 |
AMBAC FINANCIAL GROUP, INC PARENT COMPANY ONLY [Member] |  |  |
Assets: |  |  |
Short-term investments, at cost (approximates fair value) | 30,316 | 34,899 |
Cash | 41 | 496 |
Restricted cash |  | 2,500 |
Other assets | 6,452 | 6,481 |
Total assets | (2,183,915) | (2,087,743) |
Liabilities: |  |  |
Liabilities subject to compromise | 1,704,939 | 1,707,456 |
Current taxes | 1,900 | 1,900 |
Accounts payable and other liabilities | 16,773 | 15,876 |
Total liabilities | 1,723,612 | 1,725,232 |
Stockholders' deficit: |  |  |
Preferred stock, par value $0.01 per share; authorized shares-4,000,000; issued and outstanding shares-none |  |  |
Common stock, par value $0.01 per share; authorized shares-650,000,000 at December 31, 2012 and 2011; issued and outstanding shares-308,016,764 at December 31, 2012 and 2011 | 3,080 | 3,080 |
Additional paid-in capital | 2,172,027 | 2,172,027 |
Accumulated other comprehensive income | 625,385 | 463,259 |
Accumulated deficit | (6,297,264) | (6,039,922) |
Common stock held in treasury at cost, 5,580,657 shares at December 31, 2012 and 5,587,953 shares at December 31, 2011 | (410,755) | (411,419) |
Total Ambac Financial Group, Inc. stockholders' deficit | (3,907,527) | (3,812,975) | (2,008,536)
Total liabilities and stockholders' deficit | (2,183,915) | (2,087,743) |
AMBAC FINANCIAL GROUP, INC PARENT COMPANY ONLY [Member] | Non-debtors subsidiaries [Member] |  |  |
Assets: |  |  |
Investments in non-debtor subsidiaries | $ (2,220,724) | $ (2,132,119) |

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