GOODWILL AND OTHER INTANGIBLE ASSETS - Summary of Re-Allocations of Goodwill (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Roll Forward]
Goodwill, beginning of period	$ 50,209,000	$ 50,209,000
Impairment	0	0	$ (80,105,000)
SingleHop Acquisition	66,008,000
Goodwill, end of period	116,217,000	50,209,000	50,209,000
Cloud and hosting services
Goodwill [Roll Forward]
Goodwill, beginning of period		50,209,000
Re-allocations		(50,209,000)
Goodwill, end of period			$ 50,209,000
INAP COLO
Goodwill [Roll Forward]
Goodwill, beginning of period	6,003,000
Re-allocations	(6,003,000)	6,003,000
Goodwill, end of period		6,003,000
INAP CLOUD
Goodwill [Roll Forward]
Goodwill, beginning of period	44,206,000
Re-allocations	(44,206,000)	44,206,000
Goodwill, end of period		$ 44,206,000
INAP US
Goodwill [Roll Forward]
Re-allocations	28,118,000
SingleHop Acquisition	66,008,000
Goodwill, end of period	94,126,000
INAP INTL
Goodwill [Roll Forward]
Re-allocations	22,091,000
Goodwill, end of period	$ 22,091,000