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Schedule II - Reorganization Items (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Reorganization Items [Line Items]    
U.S. Trustee fees $ 50 $ 44
Professional fees 7,165 35,778
Office lease settlement   14,007
Debt valuation adjustments   32
Total reorganization items 7,215 49,861
AMBAC FINANCIAL GROUP, INC PARENT COMPANY ONLY [Member]
    
Reorganization Items [Line Items]    
U.S. Trustee fees 50 44
Professional fees 7,165 35,778
Office lease settlement   14,007
Debt valuation adjustments   32
Total reorganization items $ 7,215 $ 49,861