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Summary of Amortized Cost and Estimated Fair Value Through Fixed Maturities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Due in one year or less, Amortized Cost $ 142,231  
Due in one year through five years, Amortized Cost 701,239  
Due in five years through ten years, Amortized Cost 49,986  
Due in ten years through fifteen years, Amortized Cost 3,799  
Due after fifteen years, Amortized Cost 17,690  
Fixed maturities, amortized cost 1,539,192 $ 1,272,948
Due in one year or less, Estimated Fair value 143,283  
Due in one year through five years, Estimated Fair value 705,430  
Due in five years through ten years, Estimated Fair value 50,812  
Due in ten years through fifteen years, Estimated Fair value 4,277  
Due after fifteen years, Estimated Fair value 17,770  
Fixed Maturities, estimated fair value 1,548,885 $ 1,283,475
Mortgage Backed Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 185,359  
Estimated Fair value 188,403  
Asset-backed Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 278,059  
Estimated Fair value 278,834  
Commercial Mortgage-Backed Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 160,829  
Estimated Fair value $ 160,076