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LONG-TERM DEBT (Details) (USD $)
0 Months Ended 12 Months Ended 0 Months Ended
Jan. 15, 2013
Dec. 31, 2014
Sep. 12, 2014
2013 Credit Facility | Revolving Credit Facility      
Debt Instrument [Line Items]      
Line of credit, maximum borrowing capacity 40,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= epam_CreditFacility2013Member
   
2013 Credit Facility | LIBOR | Revolving Credit Facility      
Debt Instrument [Line Items]      
Variable rate spread (as a percent) 1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= epam_CreditFacility2013Member
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
   
2014 Credit Facility      
Debt Instrument [Line Items]      
Line of credit, current borrowing capacity   100,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= epam_CreditFacility2014Member
 
2014 Credit Facility | Revolving Credit Facility      
Debt Instrument [Line Items]      
Line of credit, maximum borrowing capacity     200,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= epam_CreditFacility2014Member
Line of credit, maximum borrowing capacity in foreign currency     50,000,000epam_LineofCreditFacilityMaximumBorrowableAmountinForeignCurrency
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= epam_CreditFacility2014Member
Percentage of foreign subsidiaries outstanding shares of capital stock serves as collateral   65.00%epam_LineOfCreditFacilityPercentageOfEquityInterestAsCollateral
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= epam_CreditFacility2014Member
 
Line of credit, current borrowing capacity     100,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= epam_CreditFacility2014Member
Outstanding debt   $ 0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= epam_CreditFacility2014Member
 
2014 Credit Facility | LIBOR | Revolving Credit Facility      
Debt Instrument [Line Items]      
Variable rate spread (as a percent)     1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= epam_CreditFacility2014Member
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
2014 Credit Facility | Federal Funds Open Rate | Revolving Credit Facility      
Debt Instrument [Line Items]      
Variable rate spread (as a percent)     0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= epam_CreditFacility2014Member
/ us-gaap_VariableRateAxis
= epam_FederalFundsOpenRateMember