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Obligations under Investment Agreements - Principal Due under Investment and Investment Repurchase Agreements, Based on Expected Optional Draw Date (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013
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Investment [Line Items] |
Net payments due under investment agreements, Principal Amount | $ 358,733
2014 [Member] |
Investment [Line Items] |
Net payments due under investment agreements, Principal Amount |
2015 [Member] |
Investment [Line Items] |
Net payments due under investment agreements, Principal Amount | 44,374
2016 [Member] |
Investment [Line Items] |
Net payments due under investment agreements, Principal Amount | 190,051
2017 [Member] |
Investment [Line Items] |
Net payments due under investment agreements, Principal Amount | 124,308
2018 [Member] |
Investment [Line Items] |
Net payments due under investment agreements, Principal Amount |
All Later Years [Member] |
Investment [Line Items] |
Net payments due under investment agreements, Principal Amount |

X
- Definition Amount of investment agreement principal due to be paid based on the expected optional draw date. + References No definition available. + Details
Name: | ambc_InvestmentAgreementExpectedRepaymentsOfPrincipal
Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | invest_InvestmentLineItems
Namespace Prefix: | invest_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration