Investments - Summary of Unrealized Gains and Losses in Consolidated Statements of Income (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Gain (Loss) on Securities [Line Items]
Net unrealized gains recognized	$ 533	$ 897	$ 3,168	$ 1,426
Equity Securities [Member]
Gain (Loss) on Securities [Line Items]
Net gains recognized	755	730	3,422	844
Exclude: Net realized gains (losses) recognized for securities sold	$ 222	$ (167)	$ 254	$ (582)