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, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Gain (Loss) on Securities [Line Items]
Unrealized gains/(losses)	$ 770	$ 1,478	$ (579)	$ 2,358
Realized gains/(losses)	16	47	81	94
Securities sold, not yet purchased gross unrealized gains	(1)	0	0	0
Corporate Debt [Member]
Gain (Loss) on Securities [Line Items]
Unrealized gains/(losses)	(109)	195	(452)	502
Realized gains/(losses)	0	0	4	0
U.S. Treasuries [Member]
Gain (Loss) on Securities [Line Items]
Unrealized gains/(losses)	(405)	213	(1,166)	1,279
Mutual Funds Held In Rabbi Trust [Member]
Gain (Loss) on Securities [Line Items]
Unrealized gains/(losses)	1,284	1,070	1,039	577
Realized gains/(losses)	$ 16	$ 47	$ 77	$ 94