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COMMON AND PREFERRED STOCK (Series A-2 Preferred) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jan. 19, 2010
Feb. 19, 2008
Class of Stock [Line Items]          
Payment for stock issuance costs $ 0us-gaap_PaymentsOfStockIssuanceCosts $ 0us-gaap_PaymentsOfStockIssuanceCosts $ 1,765us-gaap_PaymentsOfStockIssuanceCosts    
Series A-2 Convertible Redeemable Preferred Stock          
Class of Stock [Line Items]          
Issuance of preferred stock (in shares)       290,277us-gaap_PreferredStockSharesIssued
/ us-gaap_ShareholdersEquityClassAxis
= epam_SeriesATwoPreferredStockMember
675,081us-gaap_PreferredStockSharesIssued
/ us-gaap_ShareholdersEquityClassAxis
= epam_SeriesATwoPreferredStockMember
Repurchase and retirement of Series A-2 convertible redeemable preferred stock       15,050us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
/ us-gaap_ShareholdersEquityClassAxis
= epam_SeriesATwoPreferredStockMember
 
Percentage of equity securities subject to liquidation evaluation       100.00%epam_PercentageOfEquitySecuritiesSubjectToLiquidationEvaluationInHundredths
/ us-gaap_ShareholdersEquityClassAxis
= epam_SeriesATwoPreferredStockMember
 
Compounded annual rate of return (as a percent)       12.50%epam_AnnualRateOfReturn
/ us-gaap_ShareholdersEquityClassAxis
= epam_SeriesATwoPreferredStockMember
 
Percentage of liquidation price to cash and non-cash proceeds       17.10%epam_PercentageOfLiquidationPriceToOriginalPrice
/ us-gaap_ShareholdersEquityClassAxis
= epam_SeriesATwoPreferredStockMember
 
Maximum | Series A-2 Convertible Redeemable Preferred Stock          
Class of Stock [Line Items]          
Compounded annual rate of return (as a percent)       18.00%epam_AnnualRateOfReturn
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ShareholdersEquityClassAxis
= epam_SeriesATwoPreferredStockMember
 
Minimum | Series A-2 Convertible Redeemable Preferred Stock          
Class of Stock [Line Items]          
Number of installments 3epam_PreferredStockRedemptionNumberofInstallments
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ShareholdersEquityClassAxis
= epam_SeriesATwoPreferredStockMember
       
Compounded annual rate of return, hurdle rate (as a percent)       17.00%epam_CompoundedannualrateofreturnHurdleRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ShareholdersEquityClassAxis
= epam_SeriesATwoPreferredStockMember
 
Private Placement | Series A-2 Convertible Redeemable Preferred Stock          
Class of Stock [Line Items]          
Net proceeds from issuance of stock         47,601us-gaap_SaleOfStockConsiderationReceivedOnTransaction
/ us-gaap_ShareholdersEquityClassAxis
= epam_SeriesATwoPreferredStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
Gross proceeds from issuance of preferred stock         50,000epam_ProceedsFromIssuanceOfConvertiblePreferredStockGross
/ us-gaap_ShareholdersEquityClassAxis
= epam_SeriesATwoPreferredStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
Payment for stock issuance costs         $ 2,399us-gaap_PaymentsOfStockIssuanceCosts
/ us-gaap_ShareholdersEquityClassAxis
= epam_SeriesATwoPreferredStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
Sale of stock price per share (in dollars per share)       $ 51.85us-gaap_SaleOfStockPricePerShare
/ us-gaap_ShareholdersEquityClassAxis
= epam_SeriesATwoPreferredStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
$ 74.07us-gaap_SaleOfStockPricePerShare
/ us-gaap_ShareholdersEquityClassAxis
= epam_SeriesATwoPreferredStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
Number of votes 1epam_PreferredStockNumberofVotes
/ us-gaap_ShareholdersEquityClassAxis
= epam_SeriesATwoPreferredStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember