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Investments - Summary of Amortized Cost and Estimated Fair Value of Available-for-Sale Investments, Excluding VIE Investments Held by Successor Ambac, by Contractual Maturity (Detail) - Successor [Member] - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost, Due in one year or less $ 201,230  
Amortized Cost, Due after one year through five years 1,204,340  
Amortized Cost, Due after five years through ten years 909,093  
Amortized Cost, Due after ten years 180,577  
Amortized Cost, Total 2,495,240  
Amortized Cost 6,002,458 $ 5,283,157
Estimated Fair Value, Due in one year or less 201,995  
Estimated Fair Value, Due after one year through five years 1,228,927  
Estimated Fair Value, Due after five years through ten years 940,582  
Estimated Fair Value, Due after ten years 190,932  
Estimated Fair Value due, Total 2,562,436  
Fixed income securities 6,186,101 5,334,120
Fixed Income Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 5,806,949 4,992,756
Fixed income securities 5,990,397 5,043,776
Fixed Income Securities [Member] | Residential Mortgage-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 2,323,156 1,942,285
Fixed income securities 2,387,531 1,977,338
Fixed Income Securities [Member] | Collateralized Debt Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 106,582 85,706
Fixed income securities 106,844 84,267
Fixed Income Securities [Member] | Asset-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,077,480 802,842
Fixed income securities $ 1,129,290 $ 840,527