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Schedule II - Liabilities Subject to Compromise (Detail) (Predecessor Ambac [Member], USD $)
In Thousands, unless otherwise specified
Apr. 30, 2013
Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items]    
Debt obligations and accrued interest payable   $ 1,690,312
Other   14,592
Consolidated liabilities subject to compromise 1,704,641 1,704,904
Ambac Financial Group, Inc Parent Company Only [Member]
    
Condensed Financial Statements, Captions [Line Items]    
Debt obligations and accrued interest payable   1,690,312
Other   14,592
Consolidated liabilities subject to compromise   1,704,904
Payable to non-debtor subsidiaries   35
Debtor's Liabilities subject to compromise   $ 1,704,939