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COMMITMENTS AND CONTINGENCIES (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Commitments and Contingencies [Line Items]  
Estimate of probable losses $ 20us-gaap_LossContingencyEstimateOfPossibleLoss
Construction in Progress  
Commitments and Contingencies [Line Items]  
Capitalized construction costs 18,700us-gaap_ConstructionAndDevelopmentCosts
/ epam_CommitmentAxis
= us-gaap_ConstructionInProgressMember
Estimate additional costs 4,549us-gaap_OtherConstructionCosts
/ epam_CommitmentAxis
= us-gaap_ConstructionInProgressMember
Breach of Contract Against IDEAB  
Commitments and Contingencies [Line Items]  
Legal settlement amount $ 1,000us-gaap_LitigationSettlementAmount
/ us-gaap_LitigationCaseAxis
= epam_BreachofContractAgainstIDEABMember