REVENUES - Summary of Revenue by Source (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net revenues	$ 81,962	$ 69,642	$ 156,163	$ 141,775
INAP US
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net revenues	64,067	54,113	121,142	109,575
INAP US | Colocation
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net revenues	30,866	29,614	61,802	59,626
INAP US | Network services
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net revenues	13,563	15,119	27,382	30,623
INAP US | Cloud
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net revenues	19,638	9,380	31,958	19,326
INAP INTL
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net revenues	17,895	15,529	35,021	32,200
INAP INTL | Colocation
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net revenues	1,459	1,229	2,977	2,579
INAP INTL | Network services
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net revenues	2,792	1,530	5,763	3,047
INAP INTL | Cloud
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net revenues	$ 13,644	$ 12,770	$ 26,281	$ 26,574