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Obligations Under Investment Agreements Obligations Under Investment Agreements - Principal Due Under Investment Agreements (Details) $ in Thousands | Dec. 31, 2015 USD ($)
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Investment [Line Items] |
Investment Agreement Expected Repayments of Principal | $ 100,358
2016 [Member] |
Investment [Line Items] |
Investment Agreement Expected Repayments of Principal | 0
2017 [Member] |
Investment [Line Items] |
Investment Agreement Expected Repayments of Principal | 100,358
2018 [Member] |
Investment [Line Items] |
Investment Agreement Expected Repayments of Principal | 0
2019 [Member] |
Investment [Line Items] |
Investment Agreement Expected Repayments of Principal | 0
2020 [Member] [Member] |
Investment [Line Items] |
Investment Agreement Expected Repayments of Principal | 0
All Later Years [Member] |
Investment [Line Items] |
Investment Agreement Expected Repayments of Principal | $ 0

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

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- Definition Line items represent reporting concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 12 -Sentence Column A + Details
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Namespace Prefix: | invest_
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ambc_OptionalDrawDateAxis=ambc_A2017Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ambc_OptionalDrawDateAxis=ambc_A2018Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ambc_OptionalDrawDateAxis=ambc_A2019Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |