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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Loans issued to principal officers, directors, or their affiliates 0us-gaap_LoansAndLeasesReceivableRelatedParties
Allowance for employee loans 0us-gaap_LoansAndLeasesReceivableAllowance
Non-accrual employee loans 0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Material loans past due 0us-gaap_FinancingReceivableRecordedInvestmentPastDue
Loans Under Employee Housing Program  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Interest rate on loan (as a percent) 7.50%epam_LoansInterestRateStatedPercentage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= epam_HousingLoanMember
Loan term (in years) 5 years
Minimum service period 3 years
Loans Under Employee Housing Program | Maximum  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Individual loan original amount limit 50epam_IndividualLoanOriginalAmountLimit
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= epam_HousingLoanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Authorized loan program amount 10,000epam_EmployeeHousingProgramAuthorizedLoanAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= epam_HousingLoanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember