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COMMON AND PREFERRED STOCK (Series A-3 Preferred) (Details) (Series A-3 Convertible Preferred Stock, USD $)
In Thousands, except Share data, unless otherwise specified
0 Months Ended 12 Months Ended
Apr. 15, 2010
Dec. 31, 2014
vote
Apr. 15, 2010
Class of Stock [Line Items]      
Issuance of preferred stock (in shares) 290,277us-gaap_PreferredStockSharesIssued   290,277us-gaap_PreferredStockSharesIssued
Percentage of equity securities subject to liquidation evaluation 100.00%epam_PercentageOfEquitySecuritiesSubjectToLiquidationEvaluationInHundredths    
Private Placement      
Class of Stock [Line Items]      
Sale of stock price per share (in dollars per share) $ 51.85us-gaap_SaleOfStockPricePerShare
/ us-gaap_ShareholdersEquityClassAxis
= epam_SeriesAThreePreferredStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
  $ 51.85us-gaap_SaleOfStockPricePerShare
/ us-gaap_ShareholdersEquityClassAxis
= epam_SeriesAThreePreferredStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
Net proceeds from issuance of stock $ 14,971us-gaap_SaleOfStockConsiderationReceivedOnTransaction
/ us-gaap_ShareholdersEquityClassAxis
= epam_SeriesAThreePreferredStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
   
Number of votes   1epam_PreferredStockNumberofVotes
/ us-gaap_ShareholdersEquityClassAxis
= epam_SeriesAThreePreferredStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember