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RESTRICTED CASH AND TIME DEPOSITS (Narrative) (Details) (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Cash and Cash Equivalents [Line Items] |  |
Time deposits | $ 0 us-gaap_TimeDepositsAtCarryingValue | $ 1,188,000 us-gaap_TimeDepositsAtCarryingValue
Long-term deposits | 156,000 us-gaap_DepositsAssetsNoncurrent | 225,000 us-gaap_DepositsAssetsNoncurrent
Provision for losses under customer contracts secured by ST deposits | 0 epam_ShorttermSecurityDepositsProvisionforLosses | 0 epam_ShorttermSecurityDepositsProvisionforLosses
Time deposits |  |
Cash and Cash Equivalents [Line Items] |  |
Time deposits | 0 us-gaap_TimeDepositsAtCarryingValue / us-gaap_CashAndCashEquivalentsAxis = us-gaap_BankTimeDepositsMember | 1,188,000 us-gaap_TimeDepositsAtCarryingValue / us-gaap_CashAndCashEquivalentsAxis = us-gaap_BankTimeDepositsMember
Interest rate (as a percent) |  | 2.05%epam_InterestRateOnCashInterestComponent / us-gaap_CashAndCashEquivalentsAxis = us-gaap_BankTimeDepositsMember
Long-term deposits under employee loan programs |  |
Cash and Cash Equivalents [Line Items] |  |
Long-term deposits | $ 156,000 us-gaap_DepositsAssetsNoncurrent / us-gaap_CashAndCashEquivalentsAxis = epam_EmployeeMember | $ 225,000 us-gaap_DepositsAssetsNoncurrent / us-gaap_CashAndCashEquivalentsAxis = epam_EmployeeMember

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- Definition Interest Rate on Cash Interest Component + References No definition available. + Details
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- Definition Short-term Security Deposits, Provision for Losses + References No definition available. + Details
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- Details
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- Definition Carrying value of amounts transferred to third parties for security purposes that are expected to be returned or applied towards payment after one year or beyond the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 + Details
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Namespace Prefix: | us-gaap_
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- Definition Any certificate of deposit or savings account held by a bank or other financial institution for a short-term specified period of time. Because of their short-term, time deposits are considered highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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- Details
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