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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 | $ 0 us-gaap_PaymentsOfStockIssuanceCosts | $ 0 us-gaap_PaymentsOfStockIssuanceCosts | $ 1,765 us-gaap_PaymentsOfStockIssuanceCosts |  |
Series A-2 Convertible Redeemable Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Issuance of preferred stock (in shares) |  |  |  | 290,277 us-gaap_PreferredStockSharesIssued / us-gaap_ShareholdersEquityClassAxis = epam_SeriesATwoPreferredStockMember | 675,081 us-gaap_PreferredStockSharesIssued / us-gaap_ShareholdersEquityClassAxis = epam_SeriesATwoPreferredStockMember
Repurchase and retirement of Series A-2 convertible redeemable preferred stock |  |  |  | 15,050 us-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 | 3 epam_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 |  |  |  |  | 47,601 us-gaap_SaleOfStockConsiderationReceivedOnTransaction / us-gaap_ShareholdersEquityClassAxis = epam_SeriesATwoPreferredStockMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_PrivatePlacementMember
Gross proceeds from issuance of preferred stock |  |  |  |  | 50,000 epam_ProceedsFromIssuanceOfConvertiblePreferredStockGross / us-gaap_ShareholdersEquityClassAxis = epam_SeriesATwoPreferredStockMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_PrivatePlacementMember
Payment for stock issuance costs |  |  |  |  | $ 2,399 us-gaap_PaymentsOfStockIssuanceCosts / us-gaap_ShareholdersEquityClassAxis = epam_SeriesATwoPreferredStockMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_PrivatePlacementMember
Sale of stock price per share (in dollars per share) |  |  |  | $ 51.85 us-gaap_SaleOfStockPricePerShare / us-gaap_ShareholdersEquityClassAxis = epam_SeriesATwoPreferredStockMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_PrivatePlacementMember | $ 74.07 us-gaap_SaleOfStockPricePerShare / us-gaap_ShareholdersEquityClassAxis = epam_SeriesATwoPreferredStockMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_PrivatePlacementMember
Number of votes | 1 epam_PreferredStockNumberofVotes / us-gaap_ShareholdersEquityClassAxis = epam_SeriesATwoPreferredStockMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_PrivatePlacementMember |  |  |  |

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