DESCRIPTION OF THE COMPANY AND NATURE OF OPERATIONS - Narrative (Details) ft² in Millions	12 Months Ended
	Dec. 31, 2019 ft² market point_of_presence
Real Estate Properties [Line Items]
Number of POPs | point_of_presence	94
Number of metropolitan markets | market	21
Area of real estate property | ft²	1.0
Metropolitan statistical areas | market	12
Sellable Data Center Space
Real Estate Properties [Line Items]
Area of real estate property | ft²	0.6