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GOODWILL AND INTANGIBLE ASSETS (Goodwill Roll Forward) (Details) (USD $) | 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 | Mar. 05, 2014 | Apr. 30, 2014 | Jun. 06, 2014
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance beginning of period |  |  |  | $ 22,268,000 us-gaap_Goodwill |  |  |  | $ 22,698,000 us-gaap_Goodwill | $ 22,268,000 us-gaap_Goodwill | $ 22,698,000 us-gaap_Goodwill |  |  |  |
Goodwill written-off | (2,241,000)us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss | (2,241,000)us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss |  |  |
Net effect of foreign currency exchange rate changes |  |  |  |  |  |  |  |  | (1,825,000)us-gaap_GoodwillTranslationAdjustments | (430,000)us-gaap_GoodwillTranslationAdjustments |  |  |  |
Balance end of period | 57,417,000 us-gaap_Goodwill |  |  |  | 22,268,000 us-gaap_Goodwill |  |  |  | 57,417,000 us-gaap_Goodwill | 22,268,000 us-gaap_Goodwill | 22,698,000 us-gaap_Goodwill |  |  |
North America |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance beginning of period |  |  |  | 16,438,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember |  |  |  | 16,643,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember | 16,438,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember | 16,643,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember |  |  |  |
Goodwill written-off |  |  |  |  |  |  |  |  | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember |  |  |  |  |
Net effect of foreign currency exchange rate changes |  |  |  |  |  |  |  |  | (224,000)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember | (205,000)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember |  |  |  |
Balance end of period | 31,078,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember |  |  |  | 16,438,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember |  |  |  | 31,078,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember | 16,438,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember |  |  |  |
Europe |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance beginning of period |  |  |  | 2,864,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EuropeMember |  |  |  | 2,864,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EuropeMember | 2,864,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EuropeMember | 2,864,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EuropeMember |  |  |  |
Goodwill written-off |  |  |  |  |  |  |  |  | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EuropeMember |  |  |  |  |
Net effect of foreign currency exchange rate changes |  |  |  |  |  |  |  |  | (876,000)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EuropeMember | 0 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EuropeMember |  |  |  |
Balance end of period | 26,339,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EuropeMember |  |  |  | 2,864,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EuropeMember |  |  |  | 26,339,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EuropeMember | 2,864,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EuropeMember |  |  |  |
Russia |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance beginning of period |  |  |  | 2,966,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = country_RU |  |  |  | 3,191,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = country_RU | 2,966,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = country_RU | 3,191,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = country_RU |  |  |  |
Goodwill written-off |  |  |  |  |  |  |  |  | (2,241,000)us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = country_RU |  |  |  |  |
Net effect of foreign currency exchange rate changes |  |  |  |  |  |  |  |  | (725,000)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = country_RU | (225,000)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = country_RU |  |  |  |
Balance end of period | 0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = country_RU |  |  |  | 2,966,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = country_RU |  |  |  | 0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = country_RU | 2,966,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = country_RU |  |  |  |
Netsoft |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance beginning of period |  |  |  |  |  |  |  |  |  |  |  | 2,776,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = epam_NetsoftMember |  |
Acquisition |  |  |  |  |  |  |  |  | 2,749,000 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = epam_NetsoftMember |  |  |  |  |
Balance end of period | 2,749,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = epam_NetsoftMember |  |  |  |  |  |  |  | 2,749,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = epam_NetsoftMember |  |  | 2,776,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = epam_NetsoftMember |  |
Netsoft | North America |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  | 2,749,000 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = epam_NetsoftMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember |  |  |  |  |
Netsoft | Europe |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = epam_NetsoftMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EuropeMember |  |  |  |  |
Netsoft | Russia |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = epam_NetsoftMember / us-gaap_StatementBusinessSegmentsAxis = country_RU |  |  |  |  |
Jointech |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance beginning of period |  |  |  |  |  |  |  |  |  |  |  |  | 11,033,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = epam_JointechMember |
Acquisition |  |  |  |  |  |  |  |  | 17,404,000 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = epam_JointechMember |  |  |  |  |
Balance end of period | 17,404,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = epam_JointechMember |  |  |  |  |  |  |  | 17,404,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = epam_JointechMember |  |  |  | 11,033,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = epam_JointechMember |
Jointech | North America |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = epam_JointechMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember |  |  |  |  |
Jointech | Europe |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  | 17,404,000 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = epam_JointechMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EuropeMember |  |  |  |  |
Jointech | Russia |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = epam_JointechMember / us-gaap_StatementBusinessSegmentsAxis = country_RU |  |  |  |  |
GGA |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance beginning of period |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,496,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = epam_GGASoftwareServicesLLCMember
Acquisition |  |  |  |  |  |  |  |  | 12,115,000 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = epam_GGASoftwareServicesLLCMember |  |  |  |  |
Balance end of period | 12,115,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = epam_GGASoftwareServicesLLCMember |  |  |  |  |  |  |  | 12,115,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = epam_GGASoftwareServicesLLCMember |  |  |  |  | 6,496,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = epam_GGASoftwareServicesLLCMember
GGA | North America |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  | 12,115,000 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = epam_GGASoftwareServicesLLCMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember |  |  |  |  |
GGA | Europe |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = epam_GGASoftwareServicesLLCMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EuropeMember |  |  |  |  |
GGA | Russia |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = epam_GGASoftwareServicesLLCMember / us-gaap_StatementBusinessSegmentsAxis = country_RU |  |  |  |  |
Great Fridays |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  | 6,947,000 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = epam_GreatFridaysLimitedMember |  |  |  |  |
Balance end of period | 6,947,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = epam_GreatFridaysLimitedMember |  |  |  |  |  |  |  | 6,947,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = epam_GreatFridaysLimitedMember |  |  |  |  |
Great Fridays | North America |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = epam_GreatFridaysLimitedMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NorthAmericaMember |  |  |  |  |
Great Fridays | Europe |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  | 6,947,000 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = epam_GreatFridaysLimitedMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_EuropeMember |  |  |  |  |
Great Fridays | Russia |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  | $ 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = epam_GreatFridaysLimitedMember / us-gaap_StatementBusinessSegmentsAxis = country_RU |  |  |  |  |

X
- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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