Marketable Securities - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Marketable Securities [Line Items]
Marketable securities	$ 103,800,000		$ 103,800,000		$ 197,800,000
Marketable securities unrealized loss, Less than twelve months	112,900,000		112,900,000		463,500,000
Marketable securities unrealized loss, more than twelve months	131,300,000		131,300,000		138,400,000
Marketable securities totaling	0		0		1,973,000
Marketable debt securities unrealized gain	10,500,000		10,500,000		$ 1,900,000
Available-for-sale debt securities remaining maturities greater than thirty months	0		0
Other Comprehensive Income (Loss) [Member]
Marketable Securities [Line Items]
Unrealized loss, net	$ 13,400,000	$ 2,200,000	$ 8,600,000	$ 8,800,000