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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, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost, Due in one year or less $ 158,357  
Amortized Cost, Due after one year through five years 62,715  
Amortized Cost, Due after five years through ten years 54,882  
Amortized Cost, Due after ten years 976  
Amortized Cost, Total 276,930  
Fixed income securities, amortized cost 289,712 $ 341,685
Estimated Fair Value, Due in one year or less 158,056  
Estimated Fair Value, Due after one year through five years 61,169  
Estimated Fair Value, Due after five years through ten years 51,688  
Estimated Fair Value, Due after ten years 958  
Estimated Fair Value due, Total 271,871  
Debt Securities, Available-for-sale 157,020 135,224
Residential Mortgage-Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed income securities, amortized cost 2,475 0
Debt Securities, Available-for-sale 2,446 0
Collateralized Debt Obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed income securities, amortized cost 3,131 0
Debt Securities, Available-for-sale 3,142 0
Asset-backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed income securities, amortized cost 5,049 0
Debt Securities, Available-for-sale $ 5,061 $ 0