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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) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost, Due in one year or less $ 508,478  
Amortized Cost, Due after one year through five years 1,094,712  
Amortized Cost, Due after five years through ten years 301,303  
Amortized Cost, Due after ten years 821,557  
Amortized Cost, Total 2,726,050  
Fixed income securities, amortized cost 3,451,149 $ 5,271,818
Estimated Fair Value, Due in one year or less 508,138  
Estimated Fair Value, Due after one year through five years 1,093,945  
Estimated Fair Value, Due after five years through ten years 296,305  
Estimated Fair Value, Due after ten years 815,212  
Estimated Fair Value due, Total 2,713,600  
Debt Securities, Available-for-sale $ 3,546,006