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Schedule II - Additional Information (Detail) (USD $) | 8 Months Ended | 12 Months Ended |  | 12 Months Ended |  |  | 4 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2013 | Apr. 30, 2013 | Dec. 31, 2013 5.1% Junior Surplus Notes, Segregated Account, Due 2020 [Member] | Apr. 30, 2013 General Unsecured Claims [Member] | Dec. 31, 2013 Maximum [Member] | Apr. 30, 2013 Ambac Financial Group, Inc Parent Company Only [Member] | Dec. 31, 2012 Ambac Financial Group, Inc Parent Company Only [Member] | Dec. 31, 2013 Ambac Assurance [Member] | Dec. 31, 2013 Ambac Assurance [Member] 2017 [Member]
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |
Date of incorporation |  | Apr. 29, 1991 |  |  |  |  |  |  |  |
Reimbursement of operating expenses |  |  |  |  |  |  |  |  | $ 5,000,000 | $ 4,000,000
Capital stock, shares authorized |  |  | 150,000,000 |  |  |  |  |  |  |
Common stock, shares authorized |  |  | 130,000,000 |  |  |  |  |  |  |
Common stock, par value | $ 0.01 | $ 0.01 | $ 0.01 |  |  |  |  |  |  |
Preferred stock, shares authorized |  |  | 20,000,000 |  |  |  |  |  |  |
Preferred stock, par value |  |  | $ 0.01 |  |  |  |  |  |  |
Common stock, shares issued | 45,000,000 | 45,000,000 | 45,000,000 |  |  |  |  |  |  |
Warrants issued |  |  |  |  | 5,047,138 |  |  |  |  |
Warrants issued exercise price | 16.67 | 16.67 |  |  | 16.67 |  |  |  |  |
Expiry date of warrants |  | Apr. 30, 2023 |  |  |  |  |  |  |  |
Warrant exercised | 6,312 | 6,312 |  |  |  |  |  |  |  |
Common stock, shares new issues |  | 2,524 |  |  |  |  |  |  |  |
Amount transferred to escrow account | 30,000,000 | 30,000,000 |  |  |  |  |  |  |  |
Segregated Account issue of Junior Surplus Note |  |  |  | 350,000,000 |  |  |  |  |  |
Junior Surplus Note at fair value |  |  |  | 167,020,000 |  |  |  |  |  |
Payment of interest |  | 0 |  |  |  |  |  |  |  |
Percentage of voting rights, common stock |  | 10.00% |  |  |  |  |  |  |  |
Holder's ownership |  | 5.00% |  |  |  |  |  |  |  |
Change in holder's ownership | 5.00% | 5.00% |  |  |  |  |  |  |  |
Voting shares of the emerging entity |  |  |  |  |  | 50.00% |  |  |  |
Fresh Start Reporting Date |  | Apr. 30, 2013 |  |  |  |  |  |  |  |
Discontinued Liabilities subject to compromise |  |  |  |  |  |  | 239,468,000 |  |  |
Liabilities subject to compromise contractual interest on debt |  |  |  |  |  |  | $ 27,572,000 | $ 85,371,000 |  |

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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 Junior Surplus Notes expected to be issued by the Segregated Account of Ambac Assurance to Ambac Financial Group upon Ambac Financial Group'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 Highlights the priority of payment under junior surplus notes. The Expectation is that no payment of interest on or principal of a Segregated Account Junior Surplus Note may be made until all existing and future indebtedness of the Segregated Account, including Segregated Account Surplus Notes, policy claims and claims having statutory priority have been paid in full. + References No definition available. + Details
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