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Summary of Amortized Cost and Estimated Fair Value Through Fixed Maturities (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Due in one year or less, Amortized Cost $ 149,657  
Due in one year through five years, Amortized Cost 565,754  
Due in five years through ten years, Amortized Cost 49,932  
Due in ten years through fifteen years, Amortized Cost 2,750  
Due after fifteen years, Amortized Cost 17,535  
Fixed maturities, amortized cost 1,296,990 1,187,685
Due in one year or less, Estimated Fair value 151,315  
Due in one year through five years, Estimated Fair value 573,055  
Due in five years through ten years, Estimated Fair value 50,960  
Due in ten years through fifteen years, Estimated Fair value 3,163  
Due after fifteen years, Estimated Fair value 17,062  
Fixed Maturities, estimated fair value 1,308,771 1,204,364
Mortgage Backed Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 220,398  
Estimated Fair value 222,577  
Asset-backed Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 172,988  
Estimated Fair value 173,307  
Commercial Mortgage-Backed Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 117,976  
Estimated Fair value $ 117,332