Summary of Company Cash, Cash Equivalents and Investments (Detail) - USD ($)	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, Amortized cost	$ 1,991,011,000	$ 2,115,869,000
Cash and cash equivalents, Gross unrealized gains	9,000	0
Cash and cash equivalents, Gross unrealized losses	0	0
Cash and cash equivalents	966,777,000	2,115,869,000	$ 1,502,648,000
Cash, cash equivalents and investments, Amortized cost	966,768,000	2,115,869,000
Cash, cash equivalents and investments, Gross unrealized gains	187,000	0
Cash, cash equivalents and investments, Gross unrealized losses	(1,824,000)	0
Cash, cash equivalents and investments, Fair market value	1,989,374,000	2,115,869,000
Available for sale debt securities current, Amortized cost	1,024,243,000
Available for sale debt securities current, Gross unrealized gains	178,000
Available for sale debt securities current, Gross unrealized losses	(1,824,000)
Available for sale debt securities current, Fair market value	1,022,597,000	0
Cash and Money Market Funds [Member]
Cash and Cash Equivalents [Line Items]
Available for sale debt securities, Gross unrealized gains	0	0
Available for sale debt securities, Gross unrealized losses	0	0
Cash and cash equivalents, Amortized cost	801,979,000	2,115,869,000
Cash and cash equivalents	801,979,000	2,115,869,000
Commercial Paper [Member]
Cash and Cash Equivalents [Line Items]
Available for sale debt securities, Gross unrealized gains	0
Available for sale debt securities, Gross unrealized losses	0
Available for sale debt securities, Fair market value	211,369,000
Cash and cash equivalents, Amortized cost	211,369,000
Government and Government Agency Bonds [Member]
Cash and Cash Equivalents [Line Items]
Available for sale debt securities, Gross unrealized gains	178,000
Available for sale debt securities, Gross unrealized losses	(1,542,000)
Available for sale debt securities, Fair market value	807,540,000
Cash and cash equivalents, Amortized cost	808,904,000
Cash, cash equivalents and investments, Fair market value		$ 2,115,869,000
Corporate Bond [Member]
Cash and Cash Equivalents [Line Items]
Available for sale debt securities, Gross unrealized gains	9,000
Available for sale debt securities, Gross unrealized losses	(282,000)
Available for sale debt securities, Fair market value	125,741,000
Cash and cash equivalents, Amortized cost	126,014,000
Certificates of Deposit [Member]
Cash and Cash Equivalents [Line Items]
Available for sale debt securities, Gross unrealized gains	0
Available for sale debt securities, Gross unrealized losses	0
Available for sale debt securities, Fair market value	42,745,000
Cash and cash equivalents, Amortized cost	$ 42,745,000

Available for sale debt securities current accumulated gross unrealized gain before tax.

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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