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Investments - Investments Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total investments at fair value $ 122,275 $ 130,232
Level 2 [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total investments at fair value 114,901 122,858
Level 3 [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total investments at fair value 7,374 7,374
Municipal Bonds [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total investments at fair value 8,863 14,199
Municipal Bonds [Member] | Level 2 [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total investments at fair value 1,489 6,825
Municipal Bonds [Member] | Level 3 [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total investments at fair value 7,374 7,374
Non-governmental Debt Securities [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total investments at fair value 76,757 98,130
Non-governmental Debt Securities [Member] | Level 2 [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total investments at fair value 76,757 98,130
Treasury and Federal Agencies [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total investments at fair value 36,655 17,903
Treasury and Federal Agencies [Member] | Level 2 [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total investments at fair value $ 36,655 $ 17,903