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Investments - Summary of Securities with Gross Unrealized Loss Positions Aggregated by Investment Category (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Loss, Less than Twelve Months $ (131) $ (21)
Estimated Fair Value, Less than Twelve Months 5,044 7,234
Gross Unrealized Loss, Total (131) (21)
Estimated Fair Value, Total 5,044 7,234
Fixed-Maturity Securities [Member] | Corporate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Loss, Less than Twelve Months (128) (3)
Estimated Fair Value, Less than Twelve Months 4,759 4,597
Gross Unrealized Loss, Twelve Months or Longer   0
Estimated Fair Value, Twelve Months or Longer   0
Gross Unrealized Loss, Total (128) (3)
Estimated Fair Value, Total 4,759 4,597
Fixed-Maturity Securities [Member] | Exchange-Traded Debt [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Loss, Less than Twelve Months (1) (15)
Estimated Fair Value, Less than Twelve Months 252 345
Gross Unrealized Loss, Twelve Months or Longer 0 0
Estimated Fair Value, Twelve Months or Longer 0 0
Gross Unrealized Loss, Total (1) (15)
Estimated Fair Value, Total 252 345
Fixed-Maturity Securities [Member] | Redeemable Preferred Stock [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Loss, Less than Twelve Months (2)  
Estimated Fair Value, Less than Twelve Months 33  
Gross Unrealized Loss, Total (2)  
Estimated Fair Value, Total $ 33  
Fixed-Maturity Securities [Member] | U.S. Treasury and U.S. Government Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Loss, Less than Twelve Months   (3)
Estimated Fair Value, Less than Twelve Months   2,292
Gross Unrealized Loss, Total   (3)
Estimated Fair Value, Total   $ 2,292