Basis of Presentation and Summary of Significant Accounting Policies - Allowance for Doubtful Accounts Related to Accounts Receivable (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for doubtful accounts beginning of year	$ 70,890	$ 59,963	$ 46,031
Provision for credit losses	158,549	74,309	64,377	[1]
Write-offs	(146,063)	(67,732)	(50,287)
Recoveries	9,603	4,798	3,644
Impact of foreign currency	(6,093)	(448)	(3,802)
Allowance for doubtful accounts end of year	$ 86,886	$ 70,890	$ 59,963

[1] The Company applied the modified retrospective transition method when adopting ASU 2016-02 "Leases", therefore the Company's 2018 prior results were not restated to reflect ASU 2016-02. Refer to footnote 14.