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Summary of Amortized Cost and Estimated Fair Value Through Fixed Maturities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Due in one year or less, Amortized Cost $ 112,314  
Due in one year through five years, Amortized Cost 704,693  
Due in five years through ten years, Amortized Cost 67,546  
Due in ten years through fifteen years, Amortized Cost 8,818  
Due after fifteen years, Amortized Cost 17,778  
Fixed maturities, amortized cost 1,541,284 $ 1,272,948
Due in one year or less, Estimated Fair value 113,541  
Due in one year through five years, Estimated Fair value 708,465  
Due in five years through ten years, Estimated Fair value 68,320  
Due in ten years through fifteen years, Estimated Fair value 9,246  
Due after fifteen years, Estimated Fair value 17,931  
Fixed Maturities, estimated fair value 1,550,622 $ 1,283,475
Mortgage Backed Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 201,267  
Estimated Fair value 203,980  
Asset-backed Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 257,401  
Estimated Fair value 258,171  
Commercial Mortgage-Backed Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 171,467  
Estimated Fair value $ 170,968