REVENUES - Summary of Revenue by Source (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
INAP US
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue	$ 57,076
INAP INTL
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue	17,125
Colocation | INAP US
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue	30,936
Colocation | INAP INTL
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue	1,517
Network services | INAP US
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue	13,820
Network services | INAP INTL
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue	2,971
Cloud | INAP US
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue	12,320
Cloud | INAP INTL
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue	$ 12,637