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EMPLOYEE LOANS AND ALLOWANCE FOR LOAN LOSSES (Narrative) (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans issued to principal officers, directors, or their affiliates | $ 0 us-gaap_LoansAndLeasesReceivableRelatedParties | $ 0 us-gaap_LoansAndLeasesReceivableRelatedParties | $ 0 us-gaap_LoansAndLeasesReceivableRelatedParties
Loans Under Employee Housing Program |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Minimum service period for employee housing program | 3 years |  |
Loans authorized for issuance, amount | 10,000,000 epam_EmployeeHousingProgramAuthorizedLoanAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = epam_EmployeesWithHousingLoanMember |  |
Loan term (in years) | 5 years |  |
Interest rate on loan (as a percent) | 7.50%epam_LoansInterestRateStatedPercentage / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = epam_EmployeesWithHousingLoanMember |  |
Material loans past due | 0 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = epam_EmployeesWithHousingLoanMember | 0 us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = epam_EmployeesWithHousingLoanMember |
Non-accrual employee loans | 0 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = epam_EmployeesWithHousingLoanMember | 0 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = epam_EmployeesWithHousingLoanMember |
Provision for loan losses | 0 us-gaap_FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = epam_EmployeesWithHousingLoanMember | 0 us-gaap_FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = epam_EmployeesWithHousingLoanMember | 0 us-gaap_FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = epam_EmployeesWithHousingLoanMember
Loans Under Employee Housing Program, Individual Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans authorized for issuance, amount | $ 50 epam_EmployeeHousingProgramAuthorizedLoanAmount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = epam_EmployeesWithHousingLoanIndividualLoansMember |  |

X
- Definition Amount of loans authorized for issuance related to the Company's Employee Housing Program. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The minimum service period for employees to participate in the Company's Employee Housing Program. + References No definition available. + Details
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Balance Type: | na
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- Definition Reflects the interest rate of loans charging borrowers fixed rates of interest. + References No definition available. + Details
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- Definition Reflects the term of loans issued to borrowers. + References No definition available. + Details
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- Definition The increase (decrease) in the allowance for credit losses related to financing receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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- Definition Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5111-111524 + Details
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- Definition Recorded Investment in financing receivables that are past due at the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953401-111524 + Details
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- Definition For an unclassified balance sheet, reflects the carrying amount of unpaid loan amounts due from related parties at the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(e)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph e -Article 9 + Details
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