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Investments - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Schedule of Investments [Line Items]
Available-for-sale debt securities, allowance for credit losses	$ 0		$ 0
Purchase an available-for-sale debt securities with credit deterioration	0
Available-for-sale debt securities	0	$ 9,253,000
Other investments	$ 0
Investment [Member] | Issuer Concentration [Member] | Market Value of Total Investment Portfolio [Member]
Schedule of Investments [Line Items]
Investment concentration risk percentage	5.00%

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Amount of 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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