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Investments - Breakdown of Investments with Unrealized Losses (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value $ 21,135 $ 27,002
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses (123) (109)
Continuous Unrealized Loss Position for 12 Months or Greater, Fair Value 8,456 20,678
Continuous Unrealized Loss Position for 12 Months or Greater, Unrealized Losses (147) (308)
Total Fair Value 29,591 47,680
Total Unrealized Losses (270) (417)
Corporate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value 11,129 16,015
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses (60) (58)
Continuous Unrealized Loss Position for 12 Months or Greater, Fair Value 3,608 6,112
Continuous Unrealized Loss Position for 12 Months or Greater, Unrealized Losses (52) (97)
Total Fair Value 14,737 22,127
Total Unrealized Losses (112) (155)
Municipal Fixed-Rate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value   230
Continuous Unrealized Loss Position for 12 Months or Greater, Fair Value 1,136 1,165
Continuous Unrealized Loss Position for 12 Months or Greater, Unrealized Losses (26) (22)
Total Fair Value 1,136 1,395
Total Unrealized Losses (26) (22)
Asset-Backed Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value 1,874 4,941
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses (2) (17)
Continuous Unrealized Loss Position for 12 Months or Greater, Fair Value 1,257 179
Continuous Unrealized Loss Position for 12 Months or Greater, Unrealized Losses (12) (3)
Total Fair Value 3,131 5,120
Total Unrealized Losses (14) (20)
Mortgage/Agency-Backed Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value 1,021 3,062
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses (5) (8)
Continuous Unrealized Loss Position for 12 Months or Greater, Fair Value 1,918 1,673
Continuous Unrealized Loss Position for 12 Months or Greater, Unrealized Losses (39) (38)
Total Fair Value 2,939 4,735
Total Unrealized Losses (44) (46)
U.S. Government Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value 6,527 2,754
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses (48) (26)
Continuous Unrealized Loss Position for 12 Months or Greater, Fair Value 537 11,549
Continuous Unrealized Loss Position for 12 Months or Greater, Unrealized Losses (18) (148)
Total Fair Value 7,064 14,303
Total Unrealized Losses (66) $ (174)
Foreign Government Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value 584  
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses (8)  
Total Fair Value 584  
Total Unrealized Losses $ (8)