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Background and Business Description - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2014 Rate | Dec. 31, 2010 Ambac Assurance [Member] | Mar. 31, 2014 Ambac Assurance [Member] | Mar. 31, 2014 Ambac Assurance [Member] Minimum [Member]
Background And Basis Of Presentation [Line Items] |  |  |  |
Net par exposure for policies allocated to the Segregated Account |  |  | $ 21,557,994,000 |
Issuance of secured note to segregated account |  | 2,000,000,000 |  |
Secured note maturity year |  | 2050 |  |
Interest on the secured note accrues |  | 4.50% |  |
Available secured notes including capitalized interest |  |  | 22,957,000 |
Minimum surplus amount |  |  |  | 100,000,000
Policyholders surplus |  |  | $ 1,007,600,000 |
Accrued rate of interest on outstanding policy obligations (percent) | 5.10% |  |  |
Payment of permitted policy claim (percent) | 25.00% |  |  |
Future payment of permitted policy claim (percent) | 45.00% |  |  |
Future unpaid permitted policy claims (percent) | 55.00% |  |  |
Equalizing payment on unpaid permitted policy claim (percent) | 26.67% |  |  |

X
- Definition Rate at which the secured note accrues interest. + References No definition available. + Details
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- Details
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- Definition Reflects the effective interest rate on Deferred Amounts and Junior Deferred Amounts of the Segregated Account of Ambac as directed by the Rehabilitator of the Segregated Account. + References No definition available. + Details
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- Definition The percentage of unpaid permitted policy claims, together with interest thereon, ("Deferred Amounts") that the Rehabilitator will effectuate a payment, if the Segregated Account Rehabilitation Plan is approved. This will allow those policyholders that received 25% cash Interim Payments to receive an equalizing payment on their Deferred Amounts. + References No definition available. + Details
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- Definition Percentage of the Segregated Account of Ambac Assurance's permitted policy claims that are expected to be paid in cash after approved by the Rehabilitation Court. + References No definition available. + Details
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- Definition Percentage of the Segregated Account of Ambac Assurance's permitted policy claims that will be unpaid if the amendments to the Segregated Account Rehabilitation Plan are confirmed by the Rehabilitation Court. + References No definition available. + Details
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- Definition Minimum surplus amount that will cap the benefits of the Reinsurance Agreement between entity and the Segregated Account of entity. + References No definition available. + Details
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- Definition Net par outstanding for policies allocated to the Segregated Account of Ambac Assurance. + References No definition available. + Details
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- Definition Percentage of the Segregated Account of Ambac Assurance's permitted policy claims that are currently being paid in cash. + References No definition available. + Details
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- Definition Original issuance amount of the Secured Note issued by Ambac Assurance to the Segregated Account of Ambac Assurance in connection with the establishment of the Ambac Assurance Segregated Account. + References No definition available. + Details
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- Definition Secured note year of maturity. + References No definition available. + Details
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- Definition Current amount outstanding, including capitalized interest, relating to a Secured Note issued by Ambac Assurance to the Segregated Account of Ambac Assurance in connection with the establishment of the Ambac Assurance Segregated Account. + References No definition available. + Details
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- Definition The amount of statutory capital and surplus (stockholders' equity) as of the balance sheet date using prescribed or permitted statutory accounting practices (rather than GAAP, if different) of the state or country. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.23(c)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 24 -Subparagraph c -Article 7 + Details
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