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Financial Guarantee Insurance Contracts Financial Guarantee Insurance Contracts - Summary of Percentage Ceded to Reinsurers and Reinsurance Recoverable and Rating Levels (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014
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Insurance [Abstract] |  |  |
Loss Reserves Ceded To Reinsurers | $ 74,519 ambc_LossReservesCededToReinsurers | $ 100,355 ambc_LossReservesCededToReinsurers |
Ceded Loss And Loss Expenses Paid Not Yet Recovered | $ 4,789 ambc_CededLossAndLossExpensesPaidNotYetRecovered | $ 139 ambc_CededLossAndLossExpensesPaidNotYetRecovered | $ (517)ambc_CededLossAndLossExpensesPaidNotYetRecovered

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- Definition Ceded Loss And Loss Expenses Paid Not Yet Recovered + References No definition available. + Details
Name: | ambc_CededLossAndLossExpensesPaidNotYetRecovered
Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The known and estimated amount recoverable as of the balance sheet date from reinsurers for claims expected to be paid or incurred by the ceding insurer. + References No definition available. + Details
Name: | ambc_LossReservesCededToReinsurers
Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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