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Subsequent Event	12 Months Ended
Subsequent Event	Dec. 31, 2012
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event On January 1, 2013, F. Thomson Leighton became the Company's new chief executive officer. Dr. Leighton co-founded Akamai and has served as the Company's Chief Scientist and as a director since August 1998. On January 24, 2013, the Company announced MediaMath's acquisition of substantially all of the assets used by the Company in the Advertising Decision Solutions business. Simultaneously with the sale, the Company entered into a multi-year relationship agreement whereby MediaMath will have exclusive rights to leverage the Company's pixel-free technology for use within digital advertising and marketing applications. On February 6, 2013, the Company announced that the Board of Directors authorized a $150 million extension of its share repurchase program, effective for a 12-month period beginning February 1, 2013. As of this date, all prior repurchase authorizations have expired.