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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
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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

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