XML 103 R87.htm IDEA: XBRL DOCUMENT
v3.19.2

Commitments and Contingencies - Additional Information (Detail) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2019 USD ($)
Loss Contingencies [Line Items] |
General Obligation Bonds Issued in 2012 and 2014 | $ 6,000,000
Gain Contingency, Unrecorded Amount | 142,000
CITIGROUP GLOBAL MARKETS [Member] |
Loss Contingencies [Line Items] |
Gain Contingency, Unrecorded Amount | 285,000
Other Party [Member] |
Loss Contingencies [Line Items] |
Gain Contingency, Unrecorded Amount | $ 2,550

X
- Definition General Obligation Bonds Issued in 2012 and 2014 + References No definition available. + Details
Name: | ambc_GeneralObligationBondsIssuedin2012and2014
Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount or range of possible amounts of gain that could be realized upon the resolution of a contingency. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6397426&loc=d3e17499-108355 + Details
Name: | us-gaap_GainContingencyUnrecordedAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial 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 No definition available. + Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=exch_CGMI
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=ambc_OtherPartyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |