ORGANIZATION (Details) - USD ($)		9 Months Ended
	May 30, 2013	Sep. 30, 2020	Sep. 30, 2019	Apr. 22, 2020	Jan. 08, 2020	Jan. 20, 2016	Jan. 15, 2016
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Issuance of common stock, value		$ 26,492,000	$ 47,777,000
Common stock, par value (in usd per share)				$ 0.01
Class I Shares
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Issuance of common stock, value	$ 10,000,000
Common stock, par value (in usd per share)	$ 0.01				$ 0.01
Class D Shares
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Common stock, par value (in usd per share)							$ 0.01
Class M-I Shares
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Common stock, par value (in usd per share)				0.01
Class S Shares
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Common stock, par value (in usd per share)				0.01
Class T2 Shares
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Common stock, par value (in usd per share)				0.01
Class Z Shares
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Common stock, par value (in usd per share)				$ 0.01
Class A Shares
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Common stock, par value (in usd per share)					0.01
Class T Shares
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Common stock, par value (in usd per share)					0.01
Class N Shares
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Common stock, par value (in usd per share)					$ 0.01
Private Offering | Class D Shares
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Amount of stock authorized for sale						$ 350,000,000
Second Follow-On Offering
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Amount of stock authorized for sale					$ 2,300,000,000
Second Follow-On Offering | Common Class A, Class I, and Class T
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Amount of stock authorized for sale					2,100,000,000
Second Follow-On Offering | Common Class A, Class I, Class N, and Class T
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Amount of stock authorized for sale					$ 200,000,000