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Investments - Summary of Amortized Cost, Allowance for Credit Loss, Gross Unrealized Gains and Losses, and Estimated Fair Value of Available-for-Sale Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Fixed-maturity securities, Cost or Amortized Cost | $ 91,166 |  |  | $ 199,954
Fixed-maturity securities, Allowance for Credit Loss | (596) | $ (526) | $ (439) | 0
Fixed-maturity securities, Gross Unrealized Gain | 2,304 |  |  | 2,906
Fixed-maturity securities, Gross Unrealized Loss | (131) |  |  | (21)
Fixed-maturity securities, Estimated Fair Value | 92,743 |  |  | 202,839
Fixed-Maturity Securities [Member] | U.S. Treasury and U.S. Government Agencies [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Fixed-maturity securities, Cost or Amortized Cost | 11,629 |  |  | 26,220
Fixed-maturity securities, Gross Unrealized Gain | 253 |  |  | 78
Fixed-maturity securities, Gross Unrealized Loss |  |  |  | (3)
Fixed-maturity securities, Estimated Fair Value | 11,882 |  |  | 26,295
Fixed-Maturity Securities [Member] | Corporate Bonds [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Fixed-maturity securities, Cost or Amortized Cost | 66,898 |  |  | 157,155
Fixed-maturity securities, Allowance for Credit Loss | (564) |  |  |
Fixed-maturity securities, Gross Unrealized Gain | 1,619 |  |  | 2,212
Fixed-maturity securities, Gross Unrealized Loss | (128) |  |  | (3)
Fixed-maturity securities, Estimated Fair Value | 67,825 |  |  | 159,364
Fixed-Maturity Securities [Member] | State, Municipalities, and Political Subdivisions [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Fixed-maturity securities, Cost or Amortized Cost | 5,818 |  |  | 7,763
Fixed-maturity securities, Gross Unrealized Gain | 90 |  |  | 149
Fixed-maturity securities, Estimated Fair Value | 5,908 |  |  | 7,912
Fixed-Maturity Securities [Member] | Exchange-Traded Debt [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Fixed-maturity securities, Cost or Amortized Cost | 6,786 |  |  | 8,698
Fixed-maturity securities, Allowance for Credit Loss | (32) |  |  |
Fixed-maturity securities, Gross Unrealized Gain | 342 |  |  | 462
Fixed-maturity securities, Gross Unrealized Loss | (1) |  |  | (15)
Fixed-maturity securities, Estimated Fair Value | 7,095 |  |  | 9,145
Fixed-Maturity Securities [Member] | Redeemable Preferred Stock [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Fixed-maturity securities, Cost or Amortized Cost | 35 |  |  | 118
Fixed-maturity securities, Gross Unrealized Gain |  |  |  | 5
Fixed-maturity securities, Gross Unrealized Loss | (2) |  |  |
Fixed-maturity securities, Estimated Fair Value | $ 33 |  |  | $ 123

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