Fair Value Measurements - Summary of Companies Unrealized and Realized Gains and Losses on Investments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Gain (Loss) on Securities [Line Items]
Realized gains/(losses)	$ (79)		$ (155)
Unrealized gains/(losses)	(376)	$ (496)	160	$ (3,063)
Corporate Debt [Member]
Gain (Loss) on Securities [Line Items]
Realized gains/(losses)			(17)
Unrealized gains/(losses)	22		245
U.S. Treasuries [Member]
Gain (Loss) on Securities [Line Items]
Unrealized gains/(losses)	(154)		500	(445)
Mutual Funds Held In Rabbi Trust [Member]
Gain (Loss) on Securities [Line Items]
Realized gains/(losses)	(79)		(138)
Unrealized gains/(losses)	$ 200	$ 496	$ 905	$ (2,618)