ACCOUNTS RECEIVABLE, NET OF ALLOWANCE - Activity in Allowance for Doubtful Accounts (Detail) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Allowance for Doubtful Accounts Receivable [Roll Forward]
Provision for doubtful accounts	$ 3,519	$ 3,807
Balance, end of period	5,581		$ 5,711
Contract Cancellations
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance, beginning of period	5,892		5,884
Provision for doubtful accounts	3,519		6,275
Charge-offs, net	(3,830)		(6,267)
Amounts related to assets held for sale			(181)
Balance, end of period	$ 5,581		$ 5,711