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Investments - Summary of Amortized Cost and Fair Value of Investments in Fixed Maturity Securities, Classified as Held-to-Maturity (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Investment [Line Items]    
Within one year, Amortized Cost Basis $ 101,082  
After one year through five years, Amortized Cost Basis 294,889  
After five years through ten years, Amortized Cost Basis 117,736  
After ten years, Amortized Cost Basis 85,833  
Held-to-Maturity, Amortized Cost 620,165 $ 645,164
Within one year, Fair Value 102,092  
After one year through five years, Fair Value 304,442  
After five years through ten years, Fair Value 123,845  
After ten years, Fair Value 90,903  
Total, Fair Value 643,324 $ 662,276
U.S. Agency-Based Mortgage-Backed Securities [Member]    
Investment [Line Items]    
Held-to-maturity, Amortized Cost Basis 11,849  
Held-to-maturity, Fair Value 13,128  
Commercial Mortgage-Backed Securities [Member]    
Investment [Line Items]    
Held-to-maturity, Amortized Cost Basis 6,681  
Held-to-maturity, Fair Value 6,712  
Asset-Backed Securities [Member]    
Investment [Line Items]    
Held-to-maturity, Amortized Cost Basis 2,095  
Held-to-maturity, Fair Value $ 2,202