Balance Sheet Components - Activities of Allowance for Doubtful Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Beginning Balance	$ 13,026	$ 15,950	$ 18,228
Provision for credit loss allowance	5,069	8,459	7,236
Net write-offs	(10,050)	(11,341)	(8,396)
Impact of foreign currency exchange	1,732	(42)	(1,118)
Ending Balance	10,677	$ 13,026	$ 15,950
Adjustment from adoption of new accounting standard
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adjustments due to adoption of ASU 2016-13	$ 900