Audited Summarized Financial Information for Internap Japan (Detail) (Internap Japan, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010		Dec. 31, 2009
Internap Japan
Schedule of Equity Method Investments [Line Items]
Current assets	$ 6,462	$ 5,372	[1]	$ 3,908
Long-term assets	712	658	[1]	638
Current liabilities	1,355	1,288	[1]	1,126
Long-term liabilities	26
Net sales	11,636	10,357	[1]	9,794
Operating income	850	836	[1]	176
Net income	$ 787	$ 813	[1]	$ 247

[1] We have reclassified certain prior year assets from long-term to current to conform to the current year presentation.