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INCOME TAXES (Effective Income Tax Reconciliation) (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
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |  |  |  |  |  |  |  |  |
Statutory federal tax |  |  |  |  |  |  |  |  | $ 29,564 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ 26,102 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ 22,393 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Increase/ (decrease) in taxes resulting from: |  |  |  |  |  |  |  |  |  |  |
State taxes, net of federal benefit |  |  |  |  |  |  |  |  | 311 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 368 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 280 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Provision adjustment for current year uncertain tax position |  |  |  |  |  |  |  |  | (1,220)us-gaap_IncomeTaxReconciliationTaxContingencies | 0 us-gaap_IncomeTaxReconciliationTaxContingencies | 0 us-gaap_IncomeTaxReconciliationTaxContingencies
Effect of permanent differences |  |  |  |  |  |  |  |  | 8,589 epam_IncomeTaxReconciliationPermanentDifferences | 2,524 epam_IncomeTaxReconciliationPermanentDifferences | 2,177 epam_IncomeTaxReconciliationPermanentDifferences
Stock-based compensation |  |  |  |  |  |  |  |  | 3,782 us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost | 1,948 us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost | 1,165 us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost
Rate differential between U.S. and foreign |  |  |  |  |  |  |  |  | (24,772)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential | (17,279)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential | (14,472)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Change in foreign tax rate |  |  |  |  |  |  |  |  | 754 us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate | (59)us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate | 148 us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate
Change in valuation allowance |  |  |  |  |  |  |  |  | 149 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | 489 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | (489)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Other |  |  |  |  |  |  |  |  | 155 us-gaap_IncomeTaxReconciliationOtherReconcilingItems | 683 us-gaap_IncomeTaxReconciliationOtherReconcilingItems | 177 us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Total | $ 6,159 us-gaap_IncomeTaxExpenseBenefit | $ 3,338 us-gaap_IncomeTaxExpenseBenefit | $ 3,587 us-gaap_IncomeTaxExpenseBenefit | $ 4,228 us-gaap_IncomeTaxExpenseBenefit | $ 4,553 us-gaap_IncomeTaxExpenseBenefit | $ 3,919 us-gaap_IncomeTaxExpenseBenefit | $ 3,317 us-gaap_IncomeTaxExpenseBenefit | $ 2,987 us-gaap_IncomeTaxExpenseBenefit | $ 17,312 us-gaap_IncomeTaxExpenseBenefit | $ 14,776 us-gaap_IncomeTaxExpenseBenefit | $ 11,379 us-gaap_IncomeTaxExpenseBenefit

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e32123-109318 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign income tax expense (benefit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 1 -Article 4 + Details
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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