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Fair Value Measurements - Narrative (Details) (ADS Divesiture [Member], USD $)
3 Months Ended 9 Months Ended
Jun. 30, 2014
Sep. 30, 2014
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]      
Convertible note receivable converted to preferred stock amount $ 12,500,000akam_ConvertibleNoteReceivableConvertedtoPreferredStockAmount    
Proceeds from conversion of note receivable   12,500,000us-gaap_ProceedsFromCollectionOfNotesReceivable  
Level 3      
Schedule of Available-for-sale Securities [Line Items]      
Face value of convertible note receivable received for divestiture of a business     $ 25,000,000.0us-gaap_NotesAndLoansReceivableGrossNoncurrent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= akam_ADSDivesitureMember