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OPERATING SEGMENTS (Geographical Information of Long-Lived Assets Based on Physical Location) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Long-Lived Assets by Geographical Areas [Line Items] |  |
Long-lived assets | $ 55,134 us-gaap_PropertyPlantAndEquipmentNet | $ 53,315 us-gaap_PropertyPlantAndEquipmentNet
Belarus |  |
Long-Lived Assets by Geographical Areas [Line Items] |  |
Long-lived assets | 41,652 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_BY | 38,697 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_BY
Ukraine |  |
Long-Lived Assets by Geographical Areas [Line Items] |  |
Long-lived assets | 4,392 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_UA | 5,525 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_UA
Hungary |  |
Long-Lived Assets by Geographical Areas [Line Items] |  |
Long-lived assets | 2,773 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_HU | 2,644 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_HU
Russia |  |
Long-Lived Assets by Geographical Areas [Line Items] |  |
Long-lived assets | 2,196 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_RU | 3,414 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_RU
United States |  |
Long-Lived Assets by Geographical Areas [Line Items] |  |
Long-lived assets | 2,001 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US | 2,217 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US
Other |  |
Long-Lived Assets by Geographical Areas [Line Items] |  |
Long-lived assets | $ 2,120 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = epam_OtherCountriesMember | $ 818 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = epam_OtherCountriesMember

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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 + Details
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