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Financial Guarantee Insurance Contracts - Summary of Loss Reserve Roll-Forward, Net of Subrogation Recoverable and Reinsurance (Detail)
€ in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2016
EUR (€)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2015
EUR (€)
Dec. 31, 2015
USD ($)
Successor [Member]              
Loss And Loss Adjustment Expense Reserves [Line Items]              
Ceded Loss And Loss Expenses Paid Not Yet Recovered $ 143   $ 4,662       $ (60)
Policyholder Benefits and Claims Incurred, Ceded (4,383)   (6,907) $ (11,990) $ (30,727)    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]              
Beginning gross loss and loss expense reserves       2,858,813 3,798,733    
Less reinsurance on loss and loss expense reserves       44,059 100,355    
Beginning balance of net loss and loss expense reserves       2,814,754 3,698,378    
Current year:              
ambc_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsCurrentYear       11,033 1,404    
Claim and loss expense payments, net of subrogation and reinsurance       2,056 0    
Total current year       8,977 1,404    
Prior years:              
Change in previously established loss and loss expense reserves, gross of RMBS subrogation and net of reinsurance       (207,615) (414,642)    
Claim and loss expense (payments) recoveries, net of subrogation and reinsurance       (950,810) 61,740    
Change in previously established RMBS subrogation recoveries, net of reinsurance       (87,310) (31,744)    
Liability For Unpaid Claims And Claims Adjustment Expense Change In Loss Reserves Prior Year       655,885 (508,126)    
Net change in loss and loss expense reserves       664,862 (506,722)    
Liability for Unpaid Claims and Claims Adjustment Expense, Net 3,479,616   3,191,656 2,814,754 3,698,378   $ 2,814,754
Add reinsurance on loss and loss expense reserves 24,298   63,657 24,298 63,657    
Ending gross loss and loss expense reserves 3,503,914   3,255,313 3,503,914 3,255,313    
Euro Member Countries, Euro              
Prior years:              
Ending gross loss and loss expense reserves $ 17,029 € 15,153 $ 16,094 $ 17,029 $ 16,094 € 14,415