Investments (Limited Partnership Investments) - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule Of Investments [Line Items]
Recognized investment income (loss)	$ 3,963	$ 4,947	$ (1,595)
Distributions From Limited Partnership For Return On Investment	3,001	3,604	1,215
Distributions received from limited partnership interests	3,001	3,604	1,215
Limited Partnership [Member]
Schedule Of Investments [Line Items]
Recognized investment income (loss)	3,963	4,947	(1,595)
Company's net cumulative contributed capital to the partnership	24,978	28,371
Maximum exposure loss relating to VIE	25,702	28,133
Cash distributions			3,301
Distributions From Limited Partnership For Return On Investment	3,001	3,604	1,215
Distributions received from limited partnership interests	3,001	3,604	1,215
Return of capital	$ 5,360	$ 4,657	$ 2,086