Fair Value Measurements - Summary of Companies Unrealized and Realized Gains and Losses on Investments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Gain (Loss) on Securities [Line Items]
Unrealized gains/(losses)	$ 1,478	$ 915	$ 2,358	$ 1,261
Realized gains/(losses)	47	(412)	94	(375)
Securities sold, not yet purchased gross unrealized gains	0	44	0	44
Corporate Debt [Member]
Gain (Loss) on Securities [Line Items]
Unrealized gains/(losses)	195	(18)	502	(91)
Realized gains/(losses)	0	0	0	2
U.S. Treasuries [Member]
Gain (Loss) on Securities [Line Items]
Unrealized gains/(losses)	213	262	1,279	7
Mutual Funds Held In Rabbi Trust [Member]
Gain (Loss) on Securities [Line Items]
Unrealized gains/(losses)	1,070	671	577	1,345
Realized gains/(losses)	$ 47	$ (412)	$ 94	$ (377)