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OPERATING SEGMENTS (Revenues by Client Location) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 202,184 us-gaap_SalesRevenueNet | $ 192,764 us-gaap_SalesRevenueNet | $ 174,695 us-gaap_SalesRevenueNet | $ 160,384 us-gaap_SalesRevenueNet | $ 157,585 us-gaap_SalesRevenueNet | $ 140,150 us-gaap_SalesRevenueNet | $ 133,184 us-gaap_SalesRevenueNet | $ 124,198 us-gaap_SalesRevenueNet | $ 730,027 us-gaap_SalesRevenueNet | $ 555,117 us-gaap_SalesRevenueNet | $ 433,799 us-gaap_SalesRevenueNet
Reimbursable expenses and other revenues |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 8,410 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = epam_AllOtherMember | 7,626 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = epam_AllOtherMember | 6,417 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = epam_AllOtherMember
United States |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 318,304 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US | 247,979 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US | 197,593 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US
United Kingdom |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 141,366 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_GB | 108,892 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_GB | 98,346 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_GB
Switzerland |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 87,111 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CH | 51,941 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CH | 30,120 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CH
Russia |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 48,945 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_RU | 53,328 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_RU | 47,507 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_RU
Canada |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 49,193 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CA | 33,759 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CA | 9,256 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CA
Germany |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 25,740 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_DE | 20,261 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_DE | 16,391 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_DE
China |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 13,445 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CN | 0 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CN | 0 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CN
Netherlands |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 8,838 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_NL | 7,719 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_NL | 3,127 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_NL
Sweden |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 7,892 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_SE | 5,742 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_SE | 4,913 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_SE
Kazakhstan |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 5,238 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_KZ | 9,886 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_KZ | 11,352 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_KZ
Other locations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 15,545 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = epam_OtherCountriesMember | $ 7,984 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = epam_OtherCountriesMember | $ 8,777 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = epam_OtherCountriesMember

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