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Investments - Summary of Amortized Cost and Fair Value of Investments in Fixed Maturity Securities, Classified as Available-for-Sale (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Investment [Line Items]    
Within one year, Amortized Cost Basis $ 68,399  
After one year through five years, Amortized Cost Basis 213,596  
After five years through ten years, Amortized Cost Basis 38,679  
After ten years, Amortized Cost Basis 127,797  
Total , Amortized Cost Basis 460,497 $ 376,109
Within one year, Fair Value 68,884  
After one year through five years, Fair Value 216,619  
After five years through ten years, Fair Value 39,845  
After ten years, Fair Value 133,992  
Total, Fair Value 470,620 $ 380,022
U.S. Agency-Based Mortgage-Backed Securities [Member]    
Investment [Line Items]    
Available-for-sale securities, Amortized Cost Basis 12,026  
Available-for-sale securities, Fair value $ 11,280