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COMMON AND PREFERRED STOCK (IPO and Other Transactions) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 0 Months Ended | 12 Months Ended | 3 Months Ended | 1 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 19, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2012 | Feb. 29, 2012 | Feb. 07, 2012
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock, stock split ratio | 8 us-gaap_StockholdersEquityNoteStockSplitConversionRatio1 |  |  |  |  |  |
Common stock, shares authorized | 160,000,000 us-gaap_CommonStockSharesAuthorized | 160,000,000 us-gaap_CommonStockSharesAuthorized | 160,000,000 us-gaap_CommonStockSharesAuthorized |  |  |  |
Preferred stock, shares authorized | 40,000,000 us-gaap_PreferredStockSharesAuthorized |  |  |  |  |  |
Common stock issued (in shares) |  | 48,748,298 us-gaap_CommonStockSharesIssued | 47,569,463 us-gaap_CommonStockSharesIssued |  |  |  | 2,900,000 us-gaap_CommonStockSharesIssued
Payment for stock issuance costs |  | $ 0 us-gaap_PaymentsOfStockIssuanceCosts | $ 0 us-gaap_PaymentsOfStockIssuanceCosts | $ 1,765 us-gaap_PaymentsOfStockIssuanceCosts |  |  |
Instant Information Inc |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock issued in connection with acquisition (in shares) |  |  |  |  | 53,336 us-gaap_StockIssuedDuringPeriodSharesAcquisitions / us-gaap_BusinessAcquisitionAxis = epam_InstantInformationIncMember |  |
Stock issued in connection with acquisition |  |  |  | 640 us-gaap_StockIssuedDuringPeriodValueAcquisitions / us-gaap_BusinessAcquisitionAxis = epam_InstantInformationIncMember | 640 us-gaap_StockIssuedDuringPeriodValueAcquisitions / us-gaap_BusinessAcquisitionAxis = epam_InstantInformationIncMember |  |
IPO |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock sold (in shares) |  |  |  |  |  | 6,900,000 epam_CommonStockShareSold / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember |
Gross proceeds from issuance of common stock |  |  |  |  |  | 34,800 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember |
Conversion of preferred stock (in shares) |  |  |  |  |  | 21,840,128 us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember |
IPO | Common Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock sold pursuant to over-allotment option granted to underwriters (in shares) |  |  |  |  |  | 900,000 epam_UnderwritersExerciseOfPublicOfferingOverAllotmentShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember |
Sale of stock price per share (in dollars per share) |  |  |  |  |  |  | 12.00 us-gaap_SaleOfStockPricePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember
Net proceeds from issuance of stock |  |  |  |  |  | 28,969 us-gaap_SaleOfStockConsiderationReceivedOnTransaction / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember |
IPO | Stockholders |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock sold (in shares) |  |  |  |  |  | 4,000,000 epam_CommonStockShareSold / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = epam_StockholdersMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember |
IPO | Underwriting Discounts and Commissions |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Payment for stock issuance costs |  |  |  |  |  | 2,436 us-gaap_PaymentsOfStockIssuanceCosts / us-gaap_IncomeStatementLocationAxis = epam_UnderwritingDiscountsAndCommissionsMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember |
IPO | Offering expenses |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Payment for stock issuance costs |  |  |  |  |  | $ 3,395 us-gaap_PaymentsOfStockIssuanceCosts / us-gaap_IncomeStatementLocationAxis = epam_OfferingExpensesMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember |

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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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- Definition Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Stock Split -URI http://asc.fasb.org/extlink&oid=6525746 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB TOPIC 4.C) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770 + Details
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