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STOCK-BASED COMPENSATION (Other Awards) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Service-Based Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options issued (in shares) 523,220us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
15,524us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
757,272us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Underlying service-based awards, unvested and outstanding (in shares) 633,442us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
344,928us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
659,872us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Service-Based Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total unrecognized compensation cost related to non-vested share-based compensation awards granted, period for recognition (in years) 1 year 8 months 15 days      
Stock options issued (in shares) 444,982us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= epam_ServiceBasedMember
     
Stock options issued, grant date fair value 18,471epam_StockOptionsIssuedGrantDateFairValue
/ us-gaap_AwardTypeAxis
= epam_ServiceBasedMember
     
Underlying service-based awards, unvested and outstanding (in shares) 545,379us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= epam_ServiceBasedMember
     
Underlying options, value at grant date 20,544epam_UnderlyingOptionsValueAtGrantDate
/ us-gaap_AwardTypeAxis
= epam_ServiceBasedMember
     
Performance-Based Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total unrecognized compensation cost related to non-vested share-based compensation awards granted 13,953us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
     
Total unrecognized compensation cost related to non-vested share-based compensation awards granted, period for recognition (in years) 1 year 9 months      
Stock options issued (in shares) 387,058us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
     
Underlying service-based awards, unvested and outstanding (in shares) 371,510us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
   
2012 Directors Plan | Service-Based Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Non-vested common stock shares issued (in shares) 7,738us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= epam_NonEmployeeDirectorCompensationPlanTwentyTwelveMember
     
Restricted stock issued, value at grant date 325us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= epam_NonEmployeeDirectorCompensationPlanTwentyTwelveMember
     
Total unrecognized compensation cost related to non-vested share-based compensation awards granted 282us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= epam_NonEmployeeDirectorCompensationPlanTwentyTwelveMember
     
Total unrecognized compensation cost related to non-vested share-based compensation awards granted, period for recognition (in years) 1 year 6 months 19 days      
2012 Plan | Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total unrecognized compensation cost related to non-vested share-based compensation awards granted 1,643us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= epam_LongTermIncentivePlanTwentyTwelveMember
     
Total unrecognized compensation cost related to non-vested share-based compensation awards granted, period for recognition (in years) 2 years 2 months 1 day      
Deferred compensation, shares issued 70,500us-gaap_DeferredCompensationArrangementWithIndividualSharesIssued
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= epam_LongTermIncentivePlanTwentyTwelveMember
     
Deferred compensation arrangement, fair value of shares issued 2,295us-gaap_DeferredCompensationArrangementWithIndividualFairValueOfSharesIssued
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= epam_LongTermIncentivePlanTwentyTwelveMember