RECEIVABLES - Summary of Activity in Allowance for Doubtful Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of period	$ 11,308	$ 7,835	$ 3,548
Provision for doubtful accounts	11,662	7,097	6,336
Write-off of bad debts	(7,788)	(3,624)	(2,049)
Balance at end of period	$ 15,182	$ 11,308	$ 7,835