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Investments - Summary of Sources of Collateral Received and Various Investment Agreement in which Collateral Pledged (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Investment [Line Items]
Fair Value Of Securities Deposited With Governmental Authorities	$ 5,975	$ 5,974
Securities Held To Collateralize And Fund Repayment Of Debt Issued Through Resecuritization Transaction Fair Value	$ 0	$ 346,212

X

- Definition

Fair value of securities deposited with governmental authorities.

+ References

No definition available.

+ Details

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Namespace Prefix:	ambc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Fair Value of securities held to collateralize and fund repayment of debt issued through a resecuritization transaction.

+ References

No definition available.

+ Details

Name:	ambc_SecuritiesHeldToCollateralizeAndFundRepaymentOfDebtIssuedThroughResecuritizationTransactionFairValue
Namespace Prefix:	ambc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- 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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