Property and Equipment - Additional Information (Detail) (Depreciable Assets, USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2012
Depreciable Assets
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense as a result of change in accounting estimate	$ (3.5)

Change in Depreciation Expense Resulting from Change in Accounting Estimate

No definition available.

Name:	inap_ChangeInDepreciationExpenseResultingFromChangeInAccountingEstimate
Namespace Prefix:	inap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration