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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Accounting Policies [Abstract]    
Assets, Fair Value Disclosure, Recurring $ 0us-gaap_AssetsFairValueDisclosureRecurring $ 0us-gaap_AssetsFairValueDisclosureRecurring
Liabilities excluding Contingent Consideration, Fair Value, Recurring $ 0epam_LiabilitiesexcludingContingentConsiderationFairValueRecurring $ 0epam_LiabilitiesexcludingContingentConsiderationFairValueRecurring