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Investments - Amortized Cost and Fair Value of Fixed Maturities Available for Sale by Contractual Maturity (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Fixed Maturities Securities Available for Sale, Due in one year or less, Amortized cost $ 17,030  
Fixed Maturities Securities Available for Sale, Due after one year through five years, Amortized cost 190,101  
Fixed Maturities Securities Available for Sale, Due after five years through ten years, Amortized cost 3,763  
Fixed Maturities Securities Available for Sale, Due after ten years, Amortized cost     
Fixed Maturities Securities Available for Sale, Amortized cost, Total 301,847  
Fixed Maturities Securities Available for Sale, Due in one year or less, Fair Value 17,017  
Fixed Maturities Securities Available for Sale, Due after one year through five years, Fair Value 189,234  
Fixed Maturities Securities Available for Sale, Due after five years through ten years, Fair Value 3,541  
Fixed Maturities Securities Available for Sale, Due after ten years, Fair Value     
Fixed Maturities Securities Available for Sale, Fair Value, Total 300,346 289,418
Mortgage-Backed and Asset-Backed Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Fixed Maturities Securities Available for Sale, Mortgage-backed Securities, Amortized cost 90,953  
Fixed Maturities Securities Available for Sale, Mortgage-backed Securities, Fair Value $ 90,554