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Schedule II - Liabilities Subject to Compromise (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]
Debt obligations and accrued interest payable	$ 1,690,312	$ 1,690,312
Other	14,592	17,109
Payable to non-debtor subsidiaries	35	35
Debtor's Liabilities subject to compromise	1,704,904	1,707,421
AMBAC FINANCIAL GROUP, INC PARENT COMPANY ONLY [Member]
Condensed Financial Statements, Captions [Line Items]
Debt obligations and accrued interest payable	1,690,312	1,690,312
Other	14,592	17,109
Payable to non-debtor subsidiaries	35	35
Debtor's Liabilities subject to compromise	$ 1,704,939	$ 1,707,456

The amount of debt and related accrued interest included in liabilities subject to compromise.

The amount of other obligations included in liabilities subject to compromise.