ACCOUNTS RECEIVABLE, NET OF ALLOWANCE - Activity in Allowance for Doubtful Accounts (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Allowance for Doubtful Accounts Receivable [Roll Forward]
Provision for doubtful accounts	$ 2,212	$ 1,144
Balance, end of period	5,973		$ 5,711
Contract Cancellations
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance, beginning of period	5,892		5,884
Provision for doubtful accounts	2,212		6,275
Charge-offs, net	(1,950)		(6,267)
Amounts related to assets held for sale	(181)		(181)
Balance, end of period	$ 5,973		$ 5,711