Investments (Limited Partnership Investments) - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Schedule Of Investments [Line Items]
Gains Losses On Limited Partnerships Interest			$ 648	$ 3,064
Distributions received from limited partnership interests			844	2,417
Limited Partnership [Member]
Schedule Of Investments [Line Items]
Gains Losses On Limited Partnerships Interest	$ 106	$ 1,265	648	3,064
Cash distributions	915	2,768	3,932	7,149
Distributions received from limited partnership interests	423	$ 371	844	$ 2,417
Company's net cumulative contributed capital to the partnership	22,646		22,646		$ 24,978
Maximum exposure loss relating to VIE	$ 23,174		$ 23,174		$ 25,702