INCOME TAXES - Preliminary Taxability of Distributions on Common Shares (Details)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Ordinary income	0.00%	0.00%	0.00%
Non-taxable return of capital	100.00%	100.00%	100.00%
Long-term capital gain	0.00%	0.00%	0.00%
Total distribution	100.00%	100.00%	100.00%

Distributions, Return of Capital, Percent of Total Distribution

No definition available.

Name:	ck0001625941_DistributionsReturnofCapitalPercentofTotalDistribution
Namespace Prefix:	ck0001625941_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration