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Fair Value Measurements - Summary of Carrying Amounts and Corresponding Fair Values for Financial Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities—held-to-maturity	$ 525,637	$ 575,850
Fixed maturity securities—available-for-sale	330,135	341,769
Equity securities	60,485	64,140
Short-term investments	34,483	57,431
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities—held-to-maturity	541,297	549,231
Fixed maturity securities—available-for-sale	330,135	341,769
Equity securities	60,485	64,140
Short-term investments	34,483	57,431
Cash and cash equivalents	85,318	70,722
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities—held-to-maturity	525,637	575,850
Fixed maturity securities—available-for-sale	330,135	341,769
Equity securities	60,485	64,140
Short-term investments	34,483	57,431
Cash and cash equivalents	$ 85,318	$ 70,722

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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