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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, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost, Due in one year or less $ 534,324  
Amortized Cost, Due after one year through five years 900,319  
Amortized Cost, Due after five years through ten years 967,158  
Amortized Cost, Due after ten years 180,380  
Amortized Cost, Total 2,582,181  
Amortized Cost 5,298,840 $ 4,939,325
Estimated Fair Value, Due in one year or less 534,445  
Estimated Fair Value, Due after one year through five years 899,172  
Estimated Fair Value, Due after five years through ten years 961,706  
Estimated Fair Value, Due after ten years 179,806  
Estimated Fair Value due, Total 2,575,129  
Fixed income securities 5,386,628 5,150,018
Fixed Income Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 4,869,500 4,514,878
Fixed income securities 4,956,876 4,725,686
Fixed Income Securities [Member] | Residential Mortgage-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,797,616 1,557,059
Fixed income securities 1,871,483 1,710,955
Fixed Income Securities [Member] | Collateralized Debt Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 82,734 21,346
Fixed income securities 81,912 21,122
Fixed Income Securities [Member] | Asset-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 836,309 833,366
Fixed income securities $ 858,104 $ 882,001