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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	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
Fixed-maturity securities, Cost or Amortized Cost	$ 403,844		$ 41,953
Allowance for Credit Loss	0	$ 0	0	$ 0	$ (579)	$ (588)
Fixed-maturity securities, Gross Unrealized Gain	51		789
Fixed-maturity securities, Gross Unrealized Loss	(5,324)		(159)
Fixed-maturity securities, Estimated Fair Value	398,571		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	372,323		17,046
Fixed-maturity securities, Gross Unrealized Gain	2		64
Fixed-maturity securities, Gross Unrealized Loss	(4,762)		(86)
Fixed-maturity securities, Estimated Fair Value	367,563		17,024
Fixed-Maturity Securities [Member] \| Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed-maturity securities, Cost or Amortized Cost	28,953		21,913
Fixed-maturity securities, Gross Unrealized Gain	27		632
Fixed-maturity securities, Gross Unrealized Loss	(556)		(53)
Fixed-maturity securities, Estimated Fair Value	28,424		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	1,761		1,759
Fixed-maturity securities, Gross Unrealized Gain	8		49
Fixed-maturity securities, Gross Unrealized Loss	(2)
Fixed-maturity securities, Estimated Fair Value	1,767		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	700		767
Fixed-maturity securities, Gross Unrealized Gain	14		44
Fixed-maturity securities, Gross Unrealized Loss	(1)
Fixed-maturity securities, Estimated Fair Value	713		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	(3)		(20)
Fixed-maturity securities, Estimated Fair Value	$ 104		$ 448