Unaudited Pro forma Results (Parenthetical) (Detail) (Voxel Holdings Incorporated, USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Voxel Holdings Incorporated
Business Acquisition, Pro Forma Information [Line Items]
Deferred tax benefit	$ 6,140	$ 6,140

Business Acquisition, Purchase Price Allocation, Deferred Income Tax Liabilities

No definition available.

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Namespace Prefix:	inap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant