INCOME TAXES (Schedule of Dividends and Distributions) (Details)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Ordinary dividends	28.00%	0.00%	0.00%
Nondividend distributions	72.00%	100.00%	100.00%
Total	100.00%	100.00%	100.00%

The percentage of total distributions for the period that are characterized as ordinary dividends.

No definition available.

Name:	ccitii_OrdinaryDividendsPercentageofDividends
Namespace Prefix:	ccitii_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration