Investments (Limited Partnership Investments) - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule Of Investments [Line Items]
Recognized investment income (loss)	$ 661	$ 3,963	$ 4,947
Distributions received from limited partnership interests	1,148	3,001	3,604
Limited Partnership [Member]
Schedule Of Investments [Line Items]
Recognized investment income (loss)	661	3,963	4,947
Company's net cumulative contributed capital to the partnership	23,346	24,978
Maximum exposure loss relating to VIE	23,583	25,702
Cash distributions			8,261
Distributions received from limited partnership interests	1,148	3,001	3,604
Return of capital	$ 3,115	$ 5,360	$ 4,657