Accounts Receivable and Allowance for Expected Credit Losses - Writeoff (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Allowance For Doubtful Accounts And Unbilled Services [Abstract]
Provision for expected credit losses	$ 16,151	$ 19,692	$ 19,602
Write-offs	$ 23,641	$ 24,717	$ 12,734