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LONG-TERM DEBT (Details) (2014 Credit Facility, Revolving Credit Facility, USD $)
3 Months Ended 0 Months Ended
Mar. 31, 2015
Sep. 12, 2014
Debt Instrument [Line Items]    
Line of credit, maximum borrowing capacity   200,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Line of credit, maximum borrowing capacity in foreign currency   50,000,000epam_LineofCreditFacilityMaximumBorrowableAmountinForeignCurrency
Percentage of foreign subsidiaries outstanding shares of capital stock serves as collateral 65.00%epam_LineOfCreditFacilityPercentageOfEquityInterestAsCollateral  
Line of credit, current borrowing capacity   100,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
Outstanding debt $ 0us-gaap_LineOfCredit  
LIBOR
   
Debt Instrument [Line Items]    
Variable rate spread   1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= epam_CreditFacility2014Member
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
Federal Funds Open Rate
   
Debt Instrument [Line Items]    
Variable rate spread   0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= epam_CreditFacility2014Member
/ us-gaap_VariableRateAxis
= epam_FederalFundsOpenRateMember