GOODWILL AND OTHER INTANGIBLE ASSETS - Summary of Re-Allocations of Goodwill (Details) - USD ($)	1 Months Ended	3 Months Ended	12 Months Ended
	Aug. 31, 2019	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Roll Forward]
Goodwill, beginning of period			$ 116,217,000	$ 50,209,000
Re-allocations				0
SingleHop Acquisition				66,008,000
Impairment	$ 0		(45,009,000)	0
Goodwill, end of period		$ 71,208,000	71,208,000	116,217,000
INAP COLO
Goodwill [Roll Forward]
Goodwill, beginning of period			0	6,003,000
Re-allocations				(6,003,000)
Goodwill, end of period		0	0	0
INAP CLOUD
Goodwill [Roll Forward]
Goodwill, beginning of period			0	44,206,000
Re-allocations				(44,206,000)
Impairment		(22,900,000)
Goodwill, end of period		0	0	0
INAP US
Goodwill [Roll Forward]
Goodwill, beginning of period			94,126,000
Re-allocations				28,118,000
SingleHop Acquisition				66,008,000
Impairment			(22,918,000)
Goodwill, end of period		71,208,000	71,208,000	94,126,000
INAP INTL
Goodwill [Roll Forward]
Goodwill, beginning of period			22,091,000
Re-allocations				22,091,000
Impairment			(22,091,000)
Goodwill, end of period		$ 0	$ 0	$ 22,091,000