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NATURE OF BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES (Risks and Uncertainties) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Concentration Risk [Line Items] |  |  |
Revenues | $ 730,027,000 us-gaap_Revenues | $ 555,117,000 us-gaap_Revenues | $ 433,799,000 us-gaap_Revenues
Customer Concentration Risk | Unbilled Revenues | UBS AG |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 16.50%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = epam_AccountsReceivableUnbilledMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = epam_UbsAgMember |  |
Number of customers | 1 epam_NumberofCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = epam_AccountsReceivableUnbilledMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = epam_UbsAgMember |  |
Customer Concentration Risk | Accounts Receivable Billed |  |  |
Concentration Risk [Line Items] |  |  |
Number of customers | 0 epam_NumberofCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = epam_AccountsReceivableBilledMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember |  |
Customer Concentration Risk | Sales Revenue, Net |  |  |
Concentration Risk [Line Items] |  |  |
Number of customers |  | 0 epam_NumberofCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember |
Customer Concentration Risk | Sales Revenue, Net | UBS AG |  |  |
Concentration Risk [Line Items] |  |  |
Number of customers | 1 epam_NumberofCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = epam_UbsAgMember |  |
Revenues | 97,600,000 us-gaap_Revenues / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = epam_UbsAgMember |  |
Customer Concentration Risk | Sales Revenue, Net | Top Five Customers |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 32.80%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = epam_TopFiveCustomersMember | 30.60%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = epam_TopFiveCustomersMember | 31.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = epam_TopFiveCustomersMember
Number of customers | 5 epam_NumberofCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = epam_TopFiveCustomersMember |  |
Revenues | 239,396,000 us-gaap_Revenues / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = epam_TopFiveCustomersMember | 169,987,000 us-gaap_Revenues / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = epam_TopFiveCustomersMember | 134,484,000 us-gaap_Revenues / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = epam_TopFiveCustomersMember
Customer Concentration Risk | Sales Revenue, Net | Top Ten Customers |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 43.90%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = epam_TopTenCustomersMember | 42.30%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = epam_TopTenCustomersMember | 44.40%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = epam_TopTenCustomersMember
Number of customers | 10 epam_NumberofCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = epam_TopTenCustomersMember |  |
Revenues | 320,126,000 us-gaap_Revenues / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = epam_TopTenCustomersMember | 234,955,000 us-gaap_Revenues / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = epam_TopTenCustomersMember | 192,426,000 us-gaap_Revenues / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = epam_TopTenCustomersMember
Supplier Concentration Risk | Cost of Goods Sold and Sales, General and Administrative Expenses |  |  |
Concentration Risk [Line Items] |  |  |
Subcontractor costs | 1,885,000 epam_SubcontractorCostsManagementSupportServices / us-gaap_ConcentrationRiskByBenchmarkAxis = epam_CostofGoodsSoldandSalesGeneralandAdministrativeExpensesMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember | 2,078,000 epam_SubcontractorCostsManagementSupportServices / us-gaap_ConcentrationRiskByBenchmarkAxis = epam_CostofGoodsSoldandSalesGeneralandAdministrativeExpensesMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember | 3,535,000 epam_SubcontractorCostsManagementSupportServices / us-gaap_ConcentrationRiskByBenchmarkAxis = epam_CostofGoodsSoldandSalesGeneralandAdministrativeExpensesMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember
CIS Countries | Geographic Concentration Risk | Assets, Total |  |  |
Concentration Risk [Line Items] |  |  |
Cash | 59,300,000 us-gaap_Cash / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AssetsTotalMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_GeographicConcentrationRiskMember / us-gaap_StatementGeographicalAxis = epam_CISCountriesMember |  |
Belarus | Geographic Concentration Risk | Assets, Total |  |  |
Concentration Risk [Line Items] |  |  |
Cash | $ 34,200,000 us-gaap_Cash / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AssetsTotalMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_GeographicConcentrationRiskMember / us-gaap_StatementGeographicalAxis = country_BY |  |

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