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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, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost, Due in one year or less $ 724,270  
Amortized Cost, Due after one year through five years 1,139,043  
Amortized Cost, Due after five years through ten years 288,308  
Amortized Cost, Due after ten years 804,791  
Amortized Cost, Total 2,956,412  
Amortized Cost 3,647,729 $ 5,271,818
Estimated Fair Value, Due in one year or less 723,823  
Estimated Fair Value, Due after one year through five years 1,142,011  
Estimated Fair Value, Due after five years through ten years 283,434  
Estimated Fair Value, Due after ten years 913,024  
Estimated Fair Value due, Total 3,062,292  
Fixed income securities 3,867,547 5,309,161
Fixed Income Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 3,001,432 4,614,623
Fixed income securities 3,221,301 4,652,172
Fixed Income Securities [Member] | Residential Mortgage-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 230,473 2,214,512
Fixed income securities 278,775 2,251,333
Fixed Income Securities [Member] | Collateralized Debt Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 87,642 50,754
Fixed income securities 87,721 51,037
Fixed Income Securities [Member] | Asset-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 373,202 531,660
Fixed income securities $ 438,759 $ 597,942