Cash, Cash Equivalents and Investments - Effective Maturity Dates of Available-for-Sale Investments (Detail) $ in Thousands	Dec. 31, 2021 USD ($)
Debt Securities, Available-for-sale [Line Items]
Less than 1 Year	$ 137,455
1-2 Years	285,172
2-3 Years	181,712
3-4 Years	73,515
4-5 Years	43,349
Fair Value, Total	721,203
Treasury Bills [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 1 Year	18,912
1-2 Years	39,753
2-3 Years	0
3-4 Years	0
4-5 Years	0
Fair Value, Total	58,665
Corporate Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 1 Year	73,088
1-2 Years	205,331
2-3 Years	175,992
3-4 Years	64,356
4-5 Years	35,539
Fair Value, Total	554,306
Asset-Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 1 Year	37,655
1-2 Years	23,370
2-3 Years	4,668
3-4 Years	8,092
4-5 Years	7,810
Fair Value, Total	81,595
Sovereign Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 1 Year	0
1-2 Years	0
2-3 Years	1,052
3-4 Years	1,067
4-5 Years	0
Fair Value, Total	2,119
Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 1 Year	4,998
1-2 Years	641
2-3 Years	0
3-4 Years	0
4-5 Years	0
Fair Value, Total	5,639
Agency Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 1 Year	2,802
1-2 Years	16,077
2-3 Years	0
3-4 Years	0
4-5 Years	0
Fair Value, Total	$ 18,879