RELATED PARTY TRANSACTIONS - Schedule of Fees Waived or Expense Supported by the Advisor and Reimbursements to the Advisor by the Company (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Total expense support from the Advisor	$ (6,966)	$ 658	$ 1,045	$ (2,205)	$ 1,767	$ 1,354	$ 1,400	$ 1,062	$ (7,468)	$ 5,583	$ 1,735
Expense support payable to the company by the Advisor	$ 5,400				$ 700				5,400	700
Expense Support Agreement | Affiliated Entity
Related Party Transaction [Line Items]
Fees deferred									3,895	901	0
Other expenses supported									2,243	4,682	1,735
Total expense support from Advisor									6,138	5,583	1,735
Reimbursement of previously deferred fees and other expenses supported									(13,606)	0	0
Total expense support from the Advisor									$ (7,468)	$ 5,583	$ 1,735