GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details)		1 Months Ended	3 Months Ended	12 Months Ended
	Aug. 01, 2019 USD ($)	Aug. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Aug. 01, 2020	Dec. 01, 2019
Goodwill [Line Items]
Goodwill and intangibles impairment		$ 0		$ 45,009,000	$ 0
Impairment of intangible assets	$ 0
Amortization expense for intangible assets				13,300,000	$ 11,100,000	$ 4,400,000
Customer relationships and trade names
Goodwill [Line Items]
Impairment of intangible assets				$ 13,100,000
Customer relationships and trade names | Minimum
Goodwill [Line Items]
Useful life				10 years
Customer relationships and trade names | Maximum
Goodwill [Line Items]
Useful life				30 years
Developed technology
Goodwill [Line Items]
Impairment of intangible assets				$ 1,000,000
Other Intangible Assets | Minimum
Goodwill [Line Items]
Useful life				4 years
Other Intangible Assets | Maximum
Goodwill [Line Items]
Useful life				30 years
INAP CLOUD
Goodwill [Line Items]
Goodwill and intangibles impairment			$ 22,900,000
Impairment of intangible assets				$ 12,900,000
Cloud INAP INTL
Goodwill [Line Items]
Goodwill and intangibles impairment			21,200,000
Ubersmith INAP INTL
Goodwill [Line Items]
Goodwill and intangibles impairment			$ 900,000
Impairment of intangible assets				$ 1,200,000
Measurement Input, Discount Rate | Minimum
Goodwill [Line Items]
Measurement input								0.120
Measurement Input, Discount Rate | Maximum
Goodwill [Line Items]
Measurement input								0.160
Subsequent Event | Measurement Input, Discount Rate | Minimum
Goodwill [Line Items]
Measurement input							0.080
Subsequent Event | Measurement Input, Discount Rate | Maximum
Goodwill [Line Items]
Measurement input							0.130
Subsequent Event | Measurement Input, Long-term Revenue Growth Rate | Minimum
Goodwill [Line Items]
Measurement input							0.020
Subsequent Event | Measurement Input, Long-term Revenue Growth Rate | Maximum
Goodwill [Line Items]
Measurement input							0.010