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OPERATING SEGMENTS (Revenues by Service Offering) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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
Revenue from External Customer [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
Software development |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 504,590 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = us-gaap_SoftwareDevelopmentMember | 374,426 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = us-gaap_SoftwareDevelopmentMember | 290,139 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = us-gaap_SoftwareDevelopmentMember
Application testing services |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 140,363 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = epam_ApplicationsMember | 109,222 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = epam_ApplicationsMember | 85,849 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = epam_ApplicationsMember
Application maintenance and support |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 58,840 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = us-gaap_SoftwareServiceSupportAndMaintenanceArrangementMember | 45,971 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = us-gaap_SoftwareServiceSupportAndMaintenanceArrangementMember | 36,056 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = us-gaap_SoftwareServiceSupportAndMaintenanceArrangementMember
Infrastructure services |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 14,198 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = epam_TechnologyInfrastructureMember | 14,433 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = epam_TechnologyInfrastructureMember | 12,424 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = epam_TechnologyInfrastructureMember
Licensing |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 3,626 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = us-gaap_SoftwareLicenseArrangementMember | 3,439 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = us-gaap_SoftwareLicenseArrangementMember | 2,914 us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = us-gaap_SoftwareLicenseArrangementMember
Reimbursable expenses and other revenues |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [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

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