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Accounts Receivable - Activity in Accounts Receivable Reserves (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Beginning balance $ 3,703us-gaap_AllowanceForDoubtfulAccountsReceivable $ 3,807us-gaap_AllowanceForDoubtfulAccountsReceivable $ 4,555us-gaap_AllowanceForDoubtfulAccountsReceivable
Charges to income from operations 32,293akam_ChargestoIncomefromOperations 17,900akam_ChargestoIncomefromOperations 15,599akam_ChargestoIncomefromOperations
Collections from cash basis customers (26,973)akam_CollectionsfromCashBasisCustomers (18,004)akam_CollectionsfromCashBasisCustomers (16,347)akam_CollectionsfromCashBasisCustomers
Ending balance $ 9,023us-gaap_AllowanceForDoubtfulAccountsReceivable $ 3,703us-gaap_AllowanceForDoubtfulAccountsReceivable $ 3,807us-gaap_AllowanceForDoubtfulAccountsReceivable