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Financial Guarantee Insurance Contracts - Summary of Balance of RMBS Subrogation Recoveries and Related Claim Liabilities, by Estimation Approach (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Insurance [Abstract] |  |
Unpaid claims on policies allocated to Segregated Account | $ 3,904,315 | $ 3,388,133

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- Definition Unpaid claims allocated to the Segregated Account on permitted policy claims. + References No definition available. + Details
Name: | ambc_UnpaidClaimsOnPoliciesAllocatedToSegregatedAccount
Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_InsuranceAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration