ORGANIZATION AND BUSINESS (Details) $ / shares in Units, ft² in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) ft² state property class_of_stock $ / shares	Mar. 30, 2020 $ / shares	Mar. 27, 2020 $ / shares	Apr. 30, 2019 USD ($)	Mar. 28, 2019 USD ($)	Dec. 31, 2018 USD ($) $ / shares	Sep. 22, 2016 USD ($) class_of_stock $ / shares	Jul. 14, 2014 $ / shares
Class of Stock [Line Items]
Number of real estate properties | property	2
Net rentable square feet | ft²	391
Number of states in which real estate properties are owned | state	2
Percentage of rentable space leased	100.00%
Classes of common stock | class_of_stock	2
Common stock, shares issued				$ 31,200,000
Unsold shares deregistered				3,500,000,000
Common Stock
Class of Stock [Line Items]
Share price (in dollars per share) | $ / shares								$ 25.00
Class A Common Stock
Class of Stock [Line Items]
Common stock, shares issued	$ 24,974					$ 24,179
Net asset value per share (in dollars per share) | $ / shares	$ 8					$ 8.60
Class T Common Stock
Class of Stock [Line Items]
Common stock, shares issued	$ 7,229					$ 7,473
Net asset value per share (in dollars per share) | $ / shares	$ 8					$ 8.60
Initial public offering
Class of Stock [Line Items]
Common stock shares authorized, value							$ 3,500,000,000.0
Multi class offering
Class of Stock [Line Items]
Common stock shares authorized, value							$ 2,500,000,000.0
Classes of common stock | class_of_stock							2
Common stock, shares issued				30,200,000
Multi class offering | Class A Common Stock
Class of Stock [Line Items]
Common stock shares authorized, value							$ 1,250,000,000.00
Share price (in dollars per share) | $ / shares							$ 10.00
Common stock, shares issued				23,300,000
Multi class offering | Class T Common Stock
Class of Stock [Line Items]
Common stock shares authorized, value							$ 1,250,000,000.00
Share price (in dollars per share) | $ / shares							$ 9.57
Common stock, shares issued				6,900,000
Distribution Reinvestment Plan
Class of Stock [Line Items]
Common stock shares authorized, value					$ 4,300,000		$ 1,000,000,000.0
Share price (in dollars per share) | $ / shares							$ 9.10
Common stock, shares issued				1,000,000
Distribution Reinvestment Plan | Class A Common Stock
Class of Stock [Line Items]
Common stock, shares issued				655,000
Distribution Reinvestment Plan | Class A Common Stock | Common Stock
Class of Stock [Line Items]
Net asset value per share (in dollars per share) | $ / shares	7.60
Distribution Reinvestment Plan | Class T Common Stock
Class of Stock [Line Items]
Common stock, shares issued				$ 350,000
Distribution Reinvestment Plan | Class T Common Stock | Common Stock
Class of Stock [Line Items]
Net asset value per share (in dollars per share) | $ / shares	$ 7.60
CCI III OP
Class of Stock [Line Items]
General partner partnership interest percentage	100.00%
Subsequent Event | Distribution Reinvestment Plan | Class A Common Stock
Class of Stock [Line Items]
Share price (in dollars per share) | $ / shares		$ 7.60
Subsequent Event | Distribution Reinvestment Plan | Class T Common Stock
Class of Stock [Line Items]
Share price (in dollars per share) | $ / shares		$ 7.60
Subsequent Event | Distribution Reinvestment Plan | Class T Common Stock | Common Stock
Class of Stock [Line Items]
Share price (in dollars per share) | $ / shares			$ 7.60