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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	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
Fixed-maturity securities, Cost or Amortized Cost	$ 153,776	$ 41,953
Allowance for Credit Loss	0	0	$ (579)	$ (588)
Fixed-maturity securities, Gross Unrealized Gain	205	789
Fixed-maturity securities, Gross Unrealized Loss	(3,297)	(159)
Fixed-maturity securities, Estimated Fair Value	150,684	42,583
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	130,261	17,046
Fixed-maturity securities, Gross Unrealized Gain	4	64
Fixed-maturity securities, Gross Unrealized Loss	(3,048)	(86)
Fixed-maturity securities, Estimated Fair Value	127,217	17,024
Fixed-Maturity Securities [Member] \| Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed-maturity securities, Cost or Amortized Cost	20,947	21,913
Fixed-maturity securities, Gross Unrealized Gain	161	632
Fixed-maturity securities, Gross Unrealized Loss	(247)	(53)
Fixed-maturity securities, Estimated Fair Value	20,861	22,492
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	1,760	1,759
Fixed-maturity securities, Gross Unrealized Gain	16	49
Fixed-maturity securities, Estimated Fair Value	1,776	1,808
Fixed-Maturity Securities [Member] \| Exchange-Traded Debt [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed-maturity securities, Cost or Amortized Cost	701	767
Fixed-maturity securities, Gross Unrealized Gain	24	44
Fixed-maturity securities, Gross Unrealized Loss	(1)
Fixed-maturity securities, Estimated Fair Value	724	811
Fixed-Maturity Securities [Member] \| Redeemable Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed-maturity securities, Cost or Amortized Cost	107	468
Fixed-maturity securities, Gross Unrealized Gain	0	0
Fixed-maturity securities, Gross Unrealized Loss	(1)	(20)
Fixed-maturity securities, Estimated Fair Value	$ 106	$ 448