Summary of Cash, Cash Equivalents and Restricted Cash Reported In Condensed Consolidated Statements of Cash Flows (Detail) - USD ($) $ in Thousands		Mar. 31, 2021		Dec. 31, 2020	Mar. 31, 2020
Cash And Cash Equivalents Period Increase Decrease [Abstract]
Cash and cash equivalents		$ 764,502		$ 1,224,490	$ 54,619
Restricted cash and cash equivalents	[1]	$ 54,666			$ 44,604
Restricted Cash and Cash Equivalents, Noncurrent, Asset, Statement of Financial Position [Extensible List]		Other			Other
Total cash, cash equivalents and restricted cash		$ 819,168	[2]		$ 99,223

[1] Restricted cash and cash equivalents is included in other assets on the accompanying consolidated balance sheet.

[2] Consists primarily of short-term cash accounts on which interest is being earned at various annual rates ranging from 0.20% to 0.35%.