RELATED PARTY TRANSACTIONS - Summary of transactions with Internap Japan (Details) (Internap Japan, USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Internap Japan
Related Party Transaction [Line Items]
Revenues	$ 109	$ 192	$ 157
Direct costs of network sales and services	87	116	91
Accounts receivable	29	43
Accounts payable

Amount for accounts payable to related parties.

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Amount of receivables arising from transactions with related parties due within one year or the normal operating cycle, if longer.

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- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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