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Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan Maturity Date	Jun. 30, 2026
Loans, Unpaid principal balance	$ 19,191	$ 20,184
Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest Rate On Term Loan		6.51%
Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest Rate On Term Loan	8.60%	8.07%
Loan Maturity Date	Dec. 15, 2046

X

- Definition

Interest Rate On Term Loan

+ References

No definition available.

+ Details

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Namespace Prefix:	ambc_
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Balance Type:	na
Period Type:	duration

X

- Definition

Loan Maturity date

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

This represents the amount of principal outstanding on loans receivable that are presented on the balance sheet at fair value, whether such presentation is as a separate caption or parenthetical disclosure.

+ References

No definition available.

+ Details

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Balance Type:	debit
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

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X

- Details

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X

- Details

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