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ACQUISITIONS (Earnout Obligation) (Details) (USD $)
12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 05, 2014
Apr. 30, 2014
Jun. 06, 2014
Oct. 31, 2014
Business Acquisition [Line Items]              
Cash, Net of Working Capital and Other Adjustments, Deferred $ 4,000,000epam_PaymentsToAcquireBusinessesDeferred $ 0epam_PaymentsToAcquireBusinessesDeferred $ 0epam_PaymentsToAcquireBusinessesDeferred        
Netsoft              
Business Acquisition [Line Items]              
Cash, Net of Working Capital and Other Adjustments, Paid       2,373,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= epam_NetsoftMember
     
Cash, Net of Working Capital and Other Adjustments, Deferred       1,022,000epam_PaymentsToAcquireBusinessesDeferred
/ us-gaap_BusinessAcquisitionAxis
= epam_NetsoftMember
     
Recorded Earnout Payable, Cash       1,825,000epam_BusinessAcquisitionRecordedEarnoutPayableCash
/ us-gaap_BusinessAcquisitionAxis
= epam_NetsoftMember
     
Recorded Earnout Payable, Stock       0epam_BusinessAcquisitionRecordedEarnoutPayableStockValue
/ us-gaap_BusinessAcquisitionAxis
= epam_NetsoftMember
     
Total Recorded Purchase Price       5,220,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= epam_NetsoftMember
     
Netsoft | Common Stock              
Business Acquisition [Line Items]              
Common Shares, Issued (in shares)       0us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_AwardTypeAxis
= us-gaap_CommonStockMember
/ us-gaap_BusinessAcquisitionAxis
= epam_NetsoftMember
     
Common Shares, Deferred (in shares)       0epam_BusinessAcquisitionEquityInterestDeferredNumberofShares
/ us-gaap_AwardTypeAxis
= us-gaap_CommonStockMember
/ us-gaap_BusinessAcquisitionAxis
= epam_NetsoftMember
     
Fair Value of Common Shares, Issued       0us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned
/ us-gaap_AwardTypeAxis
= us-gaap_CommonStockMember
/ us-gaap_BusinessAcquisitionAxis
= epam_NetsoftMember
     
Fair Value of Common Shares, Deferred       0epam_BusinessAcquisitionEquityInterestDeferredValueAssigned
/ us-gaap_AwardTypeAxis
= us-gaap_CommonStockMember
/ us-gaap_BusinessAcquisitionAxis
= epam_NetsoftMember
     
Netsoft | Maximum              
Business Acquisition [Line Items]              
Maximum Potential Earnout Payable       1,825,000epam_BusinessAcquisitionRecordedEarnoutPayableTotal
/ us-gaap_BusinessAcquisitionAxis
= epam_NetsoftMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
     
Jointech              
Business Acquisition [Line Items]              
Cash, Net of Working Capital and Other Adjustments, Paid         10,000,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= epam_JointechMember
   
Cash, Net of Working Capital and Other Adjustments, Deferred         4,000,000epam_PaymentsToAcquireBusinessesDeferred
/ us-gaap_BusinessAcquisitionAxis
= epam_JointechMember
   
Recorded Earnout Payable, Cash         15,000,000epam_BusinessAcquisitionRecordedEarnoutPayableCash
/ us-gaap_BusinessAcquisitionAxis
= epam_JointechMember
   
Recorded Earnout Payable, Stock         5,000,000epam_BusinessAcquisitionRecordedEarnoutPayableStockValue
/ us-gaap_BusinessAcquisitionAxis
= epam_JointechMember
   
Total Recorded Purchase Price         36,788,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= epam_JointechMember
   
Jointech | Common Stock              
Business Acquisition [Line Items]              
Common Shares, Issued (in shares)         0us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_AwardTypeAxis
= us-gaap_CommonStockMember
/ us-gaap_BusinessAcquisitionAxis
= epam_JointechMember
   
Common Shares, Deferred (in shares)         89,552epam_BusinessAcquisitionEquityInterestDeferredNumberofShares
/ us-gaap_AwardTypeAxis
= us-gaap_CommonStockMember
/ us-gaap_BusinessAcquisitionAxis
= epam_JointechMember
   
Fair Value of Common Shares, Issued         0us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned
/ us-gaap_AwardTypeAxis
= us-gaap_CommonStockMember
/ us-gaap_BusinessAcquisitionAxis
= epam_JointechMember
   
Fair Value of Common Shares, Deferred         2,788,000epam_BusinessAcquisitionEquityInterestDeferredValueAssigned
/ us-gaap_AwardTypeAxis
= us-gaap_CommonStockMember
/ us-gaap_BusinessAcquisitionAxis
= epam_JointechMember
   
Jointech | Maximum              
Business Acquisition [Line Items]              
Maximum Potential Earnout Payable         20,000,000epam_BusinessAcquisitionRecordedEarnoutPayableTotal
/ us-gaap_BusinessAcquisitionAxis
= epam_JointechMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
GGA              
Business Acquisition [Line Items]              
Cash, Net of Working Capital and Other Adjustments, Paid           14,892,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= epam_GGASoftwareServicesLLCMember
 
Cash, Net of Working Capital and Other Adjustments, Deferred           0epam_PaymentsToAcquireBusinessesDeferred
/ us-gaap_BusinessAcquisitionAxis
= epam_GGASoftwareServicesLLCMember
 
Recorded Earnout Payable, Cash           11,400,000epam_BusinessAcquisitionRecordedEarnoutPayableCash
/ us-gaap_BusinessAcquisitionAxis
= epam_GGASoftwareServicesLLCMember
 
Recorded Earnout Payable, Stock           0epam_BusinessAcquisitionRecordedEarnoutPayableStockValue
/ us-gaap_BusinessAcquisitionAxis
= epam_GGASoftwareServicesLLCMember
 
Total Recorded Purchase Price           26,292,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= epam_GGASoftwareServicesLLCMember
 
GGA | Common Stock              
Business Acquisition [Line Items]              
Common Shares, Issued (in shares)           0us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_AwardTypeAxis
= us-gaap_CommonStockMember
/ us-gaap_BusinessAcquisitionAxis
= epam_GGASoftwareServicesLLCMember
 
Common Shares, Deferred (in shares)           0epam_BusinessAcquisitionEquityInterestDeferredNumberofShares
/ us-gaap_AwardTypeAxis
= us-gaap_CommonStockMember
/ us-gaap_BusinessAcquisitionAxis
= epam_GGASoftwareServicesLLCMember
 
Fair Value of Common Shares, Issued           0us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned
/ us-gaap_AwardTypeAxis
= us-gaap_CommonStockMember
/ us-gaap_BusinessAcquisitionAxis
= epam_GGASoftwareServicesLLCMember
 
Fair Value of Common Shares, Deferred           0epam_BusinessAcquisitionEquityInterestDeferredValueAssigned
/ us-gaap_AwardTypeAxis
= us-gaap_CommonStockMember
/ us-gaap_BusinessAcquisitionAxis
= epam_GGASoftwareServicesLLCMember
 
Great Fridays              
Business Acquisition [Line Items]              
Cash, Net of Working Capital and Other Adjustments, Paid             10,854,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= epam_GreatFridaysLimitedMember
Cash, Net of Working Capital and Other Adjustments, Deferred             0epam_PaymentsToAcquireBusinessesDeferred
/ us-gaap_BusinessAcquisitionAxis
= epam_GreatFridaysLimitedMember
Recorded Earnout Payable, Cash             1,173,000epam_BusinessAcquisitionRecordedEarnoutPayableCash
/ us-gaap_BusinessAcquisitionAxis
= epam_GreatFridaysLimitedMember
Recorded Earnout Payable, Stock           0epam_BusinessAcquisitionRecordedEarnoutPayableStockValue
/ us-gaap_BusinessAcquisitionAxis
= epam_GreatFridaysLimitedMember
 
Total Recorded Purchase Price             12,027,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= epam_GreatFridaysLimitedMember
Great Fridays | Common Stock              
Business Acquisition [Line Items]              
Common Shares, Issued (in shares)             0us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_AwardTypeAxis
= us-gaap_CommonStockMember
/ us-gaap_BusinessAcquisitionAxis
= epam_GreatFridaysLimitedMember
Common Shares, Deferred (in shares)             0epam_BusinessAcquisitionEquityInterestDeferredNumberofShares
/ us-gaap_AwardTypeAxis
= us-gaap_CommonStockMember
/ us-gaap_BusinessAcquisitionAxis
= epam_GreatFridaysLimitedMember
Fair Value of Common Shares, Issued           0us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned
/ us-gaap_AwardTypeAxis
= us-gaap_CommonStockMember
/ us-gaap_BusinessAcquisitionAxis
= epam_GreatFridaysLimitedMember
 
Fair Value of Common Shares, Deferred           0epam_BusinessAcquisitionEquityInterestDeferredValueAssigned
/ us-gaap_AwardTypeAxis
= us-gaap_CommonStockMember
/ us-gaap_BusinessAcquisitionAxis
= epam_GreatFridaysLimitedMember
 
Great Fridays | Maximum              
Business Acquisition [Line Items]              
Maximum Potential Earnout Payable         1,173,000epam_BusinessAcquisitionRecordedEarnoutPayableTotal
/ us-gaap_BusinessAcquisitionAxis
= epam_GreatFridaysLimitedMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Total              
Business Acquisition [Line Items]              
Cash, Net of Working Capital and Other Adjustments, Paid 38,119,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= epam_NetsoftJointechGGAGreatFridaysMember
           
Cash, Net of Working Capital and Other Adjustments, Deferred 5,022,000epam_PaymentsToAcquireBusinessesDeferred
/ us-gaap_BusinessAcquisitionAxis
= epam_NetsoftJointechGGAGreatFridaysMember
           
Recorded Earnout Payable, Cash 29,398,000epam_BusinessAcquisitionRecordedEarnoutPayableCash
/ us-gaap_BusinessAcquisitionAxis
= epam_NetsoftJointechGGAGreatFridaysMember
           
Recorded Earnout Payable, Stock 5,000,000epam_BusinessAcquisitionRecordedEarnoutPayableStockValue
/ us-gaap_BusinessAcquisitionAxis
= epam_NetsoftJointechGGAGreatFridaysMember
           
Total Recorded Purchase Price 80,327,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= epam_NetsoftJointechGGAGreatFridaysMember
           
Total | Common Stock              
Business Acquisition [Line Items]              
Common Shares, Issued (in shares) 0us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_AwardTypeAxis
= us-gaap_CommonStockMember
/ us-gaap_BusinessAcquisitionAxis
= epam_NetsoftJointechGGAGreatFridaysMember
           
Common Shares, Deferred (in shares) 89,552epam_BusinessAcquisitionEquityInterestDeferredNumberofShares
/ us-gaap_AwardTypeAxis
= us-gaap_CommonStockMember
/ us-gaap_BusinessAcquisitionAxis
= epam_NetsoftJointechGGAGreatFridaysMember
           
Fair Value of Common Shares, Issued 0us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned
/ us-gaap_AwardTypeAxis
= us-gaap_CommonStockMember
/ us-gaap_BusinessAcquisitionAxis
= epam_NetsoftJointechGGAGreatFridaysMember
           
Fair Value of Common Shares, Deferred $ 2,788,000epam_BusinessAcquisitionEquityInterestDeferredValueAssigned
/ us-gaap_AwardTypeAxis
= us-gaap_CommonStockMember
/ us-gaap_BusinessAcquisitionAxis
= epam_NetsoftJointechGGAGreatFridaysMember