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COMMITMENTS AND CONTINGENCIES (Narrative) (Details) (USD $) | 12 Months Ended | 1 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2014
Commitments and Contingencies [Line Items] |  |  |  |
Operating lease expense | $ 18,200,000 us-gaap_LeaseAndRentalExpense | $ 15,664,000 us-gaap_LeaseAndRentalExpense | $ 11,594,000 us-gaap_LeaseAndRentalExpense |
Breach of Contract Against IDEAB |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Penalties | 20,000 us-gaap_OtherCommitment / us-gaap_LitigationCaseAxis = epam_BreachofContractAgainstIDEABMember |  |  |
Legal settlement amount |  |  |  | 1,000,000 us-gaap_LitigationSettlementAmount / us-gaap_LitigationCaseAxis = epam_BreachofContractAgainstIDEABMember
Construction in Progress |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Capitalized construction costs | 17,885,000 us-gaap_ConstructionAndDevelopmentCosts / us-gaap_OtherCommitmentsAxis = us-gaap_ConstructionInProgressMember |  |  |
Estimate additional costs | 8,200,000 us-gaap_OtherConstructionCosts / us-gaap_OtherCommitmentsAxis = us-gaap_ConstructionInProgressMember |  |  |
Estimate of probable losses | 2,593,000 us-gaap_LossContingencyEstimateOfPossibleLoss / us-gaap_OtherCommitmentsAxis = us-gaap_ConstructionInProgressMember |  |  |
Construction in Progress | Maximum |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Estimate of probable losses | 4,500,000 us-gaap_LossContingencyEstimateOfPossibleLoss / us-gaap_OtherCommitmentsAxis = us-gaap_ConstructionInProgressMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Employee Housing Program |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Provision for losses | 0 us-gaap_LossContingencyLossInPeriod / us-gaap_OtherCommitmentsAxis = epam_EmployeeHousingProgramMember | 0 us-gaap_LossContingencyLossInPeriod / us-gaap_OtherCommitmentsAxis = epam_EmployeeHousingProgramMember | 0 us-gaap_LossContingencyLossInPeriod / us-gaap_OtherCommitmentsAxis = epam_EmployeeHousingProgramMember |
2006 Employee Loan Program |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Provision for losses | $ 0 us-gaap_LossContingencyLossInPeriod / us-gaap_OtherCommitmentsAxis = epam_A2006EmployeeLoanProgramMember | $ 0 us-gaap_LossContingencyLossInPeriod / us-gaap_OtherCommitmentsAxis = epam_A2006EmployeeLoanProgramMember | $ 0 us-gaap_LossContingencyLossInPeriod / us-gaap_OtherCommitmentsAxis = epam_A2006EmployeeLoanProgramMember |

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