Financial Instruments - Summary of Investments (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Short-term, Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Total short-term investments (available for sale), Cost		$ 3,016
Total short-term investments (available for sale), Gross Unrealized (Loss)		(22)
Total short-term investments (available for sale), Fair value		2,994
Short-term, Non-governmental Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total short-term investments (available for sale), Cost	$ 227,417	222,575
Total short-term investments (available for sale), Gross Unrealized Gain		37
Total short-term investments (available for sale), Gross Unrealized (Loss)	(2,541)	(2,880)
Total short-term investments (available for sale), Fair value	224,876	219,732
Short-term, Treasury and Federal Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Total short-term investments (available for sale), Cost	207,083	179,068
Total short-term investments (available for sale), Gross Unrealized Gain		6
Total short-term investments (available for sale), Gross Unrealized (Loss)	(2,342)	(2,485)
Total short-term investments (available for sale), Fair value	204,741	176,589
Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Total short-term investments (available for sale), Cost	434,500	404,659
Total short-term investments (available for sale), Gross Unrealized Gain		43
Total short-term investments (available for sale), Gross Unrealized (Loss)	(4,883)	(5,387)
Total short-term investments (available for sale), Fair value	$ 429,617	$ 399,315