Transactions with Internap Japan (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Related Party Transaction [Line Items]
Revenues	$ 192	$ 157	$ 390
Direct costs of network sales and services	116	91	168
Accounts receivable	43	52
Accounts payable		$ 51