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Investments - Investments Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total investments at fair value $ 127,400 $ 130,232
Municipal Bond [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total investments at fair value 12,486 14,199
Non-governmental Debt Securities [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total investments at fair value 92,002 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 22,912 17,903
Level 2 [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total investments at fair value 120,026 122,858
Level 2 [Member] | Municipal Bond [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total investments at fair value 5,112 6,825
Level 2 [Member] | Non-governmental Debt Securities [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total investments at fair value 92,002 98,130
Level 2 [Member] | Treasury and Federal Agencies [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total investments at fair value 22,912 17,903
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
Level 3 [Member] | Municipal Bond [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Total investments at fair value $ 7,374 $ 7,374