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INAP JAPAN JOINT VENTURE - Narrative (Details) - USD ($)
$ in Millions
Aug. 15, 2017
Aug. 14, 2017
Internap Japan    
Schedule of Equity Method Investments [Line Items]    
Gain recognized $ 1.1  
Fair value inputs, discount rate 8.50%  
Internap Japan Investment    
Schedule of Equity Method Investments [Line Items]    
Investment in joint venture   $ 4.1