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Investments - Breakdown of Investments with Unrealized Losses (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]    
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value $ 8,965 $ 21,135
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses (19) (123)
Continuous Unrealized Loss Position for 12 Months or Greater, Fair Value 136 8,456
Continuous Unrealized Loss Position for 12 Months or Greater, Unrealized Losses (2) (147)
Total Fair Value 9,101 29,591
Total Unrealized Losses (21) (270)
Corporate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value 203 11,129
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses   (60)
Continuous Unrealized Loss Position for 12 Months or Greater, Fair Value   3,608
Continuous Unrealized Loss Position for 12 Months or Greater, Unrealized Losses   (52)
Total Fair Value 203 14,737
Total Unrealized Losses   (112)
Municipal Fixed-Rate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value 930  
Continuous Unrealized Loss Position for 12 Months or Greater, Fair Value   1,136
Continuous Unrealized Loss Position for 12 Months or Greater, Unrealized Losses   (26)
Total Fair Value 930 1,136
Total Unrealized Losses   (26)
Asset-Backed Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value 797 1,874
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses (3) (2)
Continuous Unrealized Loss Position for 12 Months or Greater, Fair Value   1,257
Continuous Unrealized Loss Position for 12 Months or Greater, Unrealized Losses   (12)
Total Fair Value 797 3,131
Total Unrealized Losses (3) (14)
Mortgage/Agency-Backed Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value 2,594 1,021
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses (6) (5)
Continuous Unrealized Loss Position for 12 Months or Greater, Fair Value 136 1,918
Continuous Unrealized Loss Position for 12 Months or Greater, Unrealized Losses (2) (39)
Total Fair Value 2,730 2,939
Total Unrealized Losses (8) (44)
U.S. Government Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value 4,070 6,527
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses (9) (48)
Continuous Unrealized Loss Position for 12 Months or Greater, Fair Value   537
Continuous Unrealized Loss Position for 12 Months or Greater, Unrealized Losses   (18)
Total Fair Value 4,070 7,064
Total Unrealized Losses (9) (66)
Marketable Equity Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value 371  
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses (1)  
Total Fair Value 371  
Total Unrealized Losses $ (1)  
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)