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Summary of Amortized Cost and Estimated Fair Value Through Fixed Maturities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Due in one year or less, Amortized Cost $ 68,903  
Due in one year through five years, Amortized Cost 431,430  
Due in five years through ten years, Amortized Cost 240,272  
Due in ten years through fifteen years, Amortized Cost 4,215  
Due after fifteen years, Amortized Cost 4,980  
Fixed maturities, amortized cost 1,281,954 $ 1,243,144
Due in one year or less, Estimated Fair value 68,736  
Due in one year through five years, Estimated Fair value 425,571  
Due in five years through ten years, Estimated Fair value 235,140  
Due in ten years through fifteen years, Estimated Fair value 4,170  
Due after fifteen years, Estimated Fair value 5,008  
Fixed Maturities, estimated fair value 1,262,996 $ 1,241,437
Mortgage Backed Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 176,983  
Estimated Fair value 173,785  
Asset-backed Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 203,834  
Estimated Fair value 202,745  
Commercial Mortgage-Backed Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 151,337  
Estimated Fair value $ 147,841