RECEIVABLES - Summary of Accounts Receivable (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020		Dec. 31, 2019	Dec. 31, 2018
Receivables [Abstract]
Trade accounts receivable	$ 161,751	$ 157,513
Unbilled revenues	35,933	46,471
Allowance for credit losses	(8,912)	(9,918)		$ (9,990)	$ (15,182)
Total	$ 188,772	$ 194,066	[1]
Payment terms	30 days

[1] Includes billed and unbilled amounts, net of allowance for credit losses. See Note 3 for details.