FAIR VALUE MEASUREMENTS - Summary of changes in our Level 3 financial asset, accrued contingent consideration - (Parentheticals) (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Fair Value Disclosures [Abstract]
Gross settlement adjustment	$ 250

This element represents fair value financial assets gross of settlement adjustment.

No definition available.

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