OPERATING SEGMENTS - Additional Information (Details)	3 Months Ended
	Mar. 31, 2018 point_of_presence segment
Segment Reporting [Abstract]
Number of reportable segments (segment) | segment	2
Segment Reporting Information [Line Items]
Number of POPs (point of presence)	98
Network services
Segment Reporting Information [Line Items]
Number of POPs (point of presence)	97