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Commitments and Contingencies - Lease Financing Obligation (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Lease Financing Obligation, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]    
2014   $ 5,588anet_LeaseFinancingObligationFutureMinimumPaymentsDueNextTwelveMonths
2015   5,754anet_LeaseFinancingObligationFutureMinimumPaymentsDueinTwoYears
2016   5,933anet_LeaseFinancingObligationFutureMinimumPaymentsDueinThreeYears
2017   6,113anet_LeaseFinancingObligationFutureMinimumPaymentsDueinFourYears
2018   6,293anet_LeaseFinancingObligationFutureMinimumPaymentsDueinFiveYears
Thereafter   25,287anet_LeaseFinancingObligationFutureMinimumPaymentsDueThereafter
Total payments   54,968anet_LeaseFinancingObligationFutureMinimumPaymentsDue
Less: interest and land lease expense   (34,770)anet_LeaseFinancingObligationFutureMinimumPaymentsInterestandLandLeaseExpenseIncludedinPayments
Total payments under facility financing obligations   20,198anet_LeaseFinancingObligationFutureMinimumPaymentsNetMinimumPayments
Property reverting to landlord   23,436anet_LeaseFinancingObligationPropertyRevertingtoLandlord
Present value of obligation   43,634anet_LeaseFinancingObligationFutureMinimumPaymentsPresentValueofNetMinimumPayments
Less current portion (1,147)anet_LeaseFinancingObligationsCurrent (1,087)anet_LeaseFinancingObligationsCurrent
Long-term portion of obligation $ 42,232anet_LeaseFinancingObligationNoncurrent $ 42,547anet_LeaseFinancingObligationNoncurrent