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Financial Guarantee Insurance Contracts - Summary of Loss Reserve Roll-Forward, Net of Subrogation Recoverable and Reinsurance (Detail) - Successor [Member] - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Loss And Loss Adjustment Expense Reserves [Line Items]          
Ceded Loss And Loss Expenses Paid Not Yet Recovered $ 4,662 $ (130) $ 4,662 $ (130) $ (517)
Policyholder Benefits and Claims Incurred, Ceded (6,907) (3,885) (30,727) (16,045)  
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]          
Less reinsurance on loss and loss expense reserves     100,355    
Current year:          
ambc_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsCurrentYear     1,404 236  
Claim and loss expense payments, net of subrogation and reinsurance     0 4  
Total current year     1,404 232  
Prior years:          
Change in previously established loss and loss expense reserves, gross of RMBS subrogation and net of reinsurance     (414,642) (934)  
Claim and loss expense (payments) recoveries, net of subrogation and reinsurance     61,740 (67,736)  
Change in previously established RMBS subrogation recoveries, net of reinsurance     (31,744) (6,315)  
Liability For Unpaid Claims And Claims Adjustment Expense Change In Loss Reserves Prior Year     (508,126) 60,487  
Net change in loss and loss expense reserves     (506,722) 60,719  
Liability for Unpaid Claims and Claims Adjustment Expense, Net   5,408,596   5,408,596  
Add reinsurance on loss and loss expense reserves $ 63,657 105,641 $ 63,657 105,641  
Ending gross loss and loss expense reserves   $ 5,514,237   $ 5,514,237