REAL ESTATE ACQUISITIONS - Narrative (Details)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Intangible Lease Assets
Business Acquisition [Line Items]
Weighted-average amortization period of acquired finite-lived intangible assets	4 years 8 months 85 days	5 years 8 months 48 days

Weighted average amortization period of finite-lived intangible assets and liabilities acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Intangible lease assets and liabilities includes acquired in-place leases, above market lease assets, and below market lease liabilities.

No definition available.

Name:	ck0001625941_AcquiredFiniteLivedIntangibleAssetsAndLiabilitiesWeightedAverageUsefulLife
Namespace Prefix:	ck0001625941_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration