Investments - Summary of Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Value of Available-for-Sale Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
Fixed-maturity securities, Cost or Amortized Cost	$ 494,197	$ 41,953
Allowance for Credit Loss	0	0	$ (588)
Fixed-maturity securities, Gross Unrealized Gain	81	789
Fixed-maturity securities, Gross Unrealized Loss	(10,377)	(159)
Fixed-maturity securities, Estimated Fair Value	483,901	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	463,648	17,046
Fixed-maturity securities, Gross Unrealized Gain	59	64
Fixed-maturity securities, Gross Unrealized Loss	(9,105)	(86)
Fixed-maturity securities, Estimated Fair Value	454,602	17,024
Fixed-Maturity Securities [Member] \| Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed-maturity securities, Cost or Amortized Cost	28,378	21,913
Fixed-maturity securities, Gross Unrealized Gain	20	632
Fixed-maturity securities, Gross Unrealized Loss	(1,205)	(53)
Fixed-maturity securities, Estimated Fair Value	27,193	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	1,389	1,759
Fixed-maturity securities, Gross Unrealized Gain		49
Fixed-maturity securities, Gross Unrealized Loss	(6)
Fixed-maturity securities, Estimated Fair Value	1,383	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	683	767
Fixed-maturity securities, Gross Unrealized Gain	2	44
Fixed-maturity securities, Gross Unrealized Loss	(52)
Fixed-maturity securities, Estimated Fair Value	633	811
Fixed-Maturity Securities [Member] \| Redeemable Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed-maturity securities, Cost or Amortized Cost	99	468
Fixed-maturity securities, Gross Unrealized Loss	(9)	(20)
Fixed-maturity securities, Estimated Fair Value	$ 90	$ 448

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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