Document and Entity Information	9 Months Ended
	Sep. 30, 2014
Document and Entity Information Abstract
Entity Registrant Name	INTERNAP NETWORK SERVICES CORP
Entity Central Index Key	0001056386
Trading Symbol	inap
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock Shares Outstanding	54,385,945
Document Type	10-Q
Document Period End Date	Sep. 30, 2014
Amendment Flag	false
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q3