Accounts Receivable and Allowance for Expected Credit Losses (Tables)

12 Months Ended

Dec. 31, 2021

Allowance For Doubtful Accounts And Unbilled Services [Abstract]

Schedule of accounts receivable

The following table summarizes the components of “Accounts receivable, net” as presented on the Consolidated Balance Sheets:

	December 31,
	2021		2020
Accounts receivable:
Billed receivables	$	542,056	$	513,459
Unbilled receivables	248,681		236,285
Allowance for expected credit losses	(36,617)		(38,387)
Accounts receivable, net	$	754,120	$	711,357

The table below summarizes the changes in the carrying amount of our notes receivable from employees:

	December 31,
	2021		2020
Notes receivable from employees — beginning	$	96,374	$	104,139
Notes granted	27,772		34,383
Repayments	(5,126)		(8,043)
Amortization	(34,422)		(29,444)
Cumulative translation adjustment and other	(803)		(4,661)
Notes receivable from employees — ending	83,795		96,374
Less: current portion	(30,256)		(35,253)
Notes receivable from employees, net of current portion	$	53,539	$	61,121

Schedule of accounts receivable, writeoff

The following table summarizes total provision for expected credit losses and write-offs:

	Year Ended December 31,
	2021		2020		2019
Provision for expected credit losses	$	16,151	$	19,692	$	19,602
Write-offs	$	23,641	$	24,717	$	12,734