Investments - Schedule of Contractual Maturities of Held to Maturity Investments (Detail) - USD ($) $ in Thousands		Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Held-to-Maturity, Maturity [Abstract]
Amortized cost basis, due in one year or less	[1]	$ 241,962	$ 115,263
Amortized cost basis due after one year through five years		3,726	7,155
Amortized cost basis, total		245,688	122,418
Aggregate fair value, due in one year or less	[1]	241,970	115,374
Aggregate fair value, due after one year through five years		3,771	7,197
Aggregate fair value, total		$ 245,741	$ 122,571

[1] The investments due in one year or less include cash equivalents of $134.5 million as of March 31, 2024 and $58.6 million as of December 31, 2023.