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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Cash flows from operating activities: |  |  |
Net income | $ 69,641,000 us-gaap_NetIncomeLoss | $ 61,994,000 us-gaap_NetIncomeLoss | $ 54,484,000 us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 17,483,000 us-gaap_DepreciationDepletionAndAmortization | 15,120,000 us-gaap_DepreciationDepletionAndAmortization | 10,882,000 us-gaap_DepreciationDepletionAndAmortization
Bad debt expense | 817,000 us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs | 335,000 us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs | 662,000 us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Deferred taxes | (3,270,000)us-gaap_DeferredIncomeTaxExpenseBenefit | 41,000 us-gaap_DeferredIncomeTaxExpenseBenefit | (3,933,000)us-gaap_DeferredIncomeTaxExpenseBenefit
Stock-based compensation expense | 24,620,000 us-gaap_ShareBasedCompensation | 13,150,000 us-gaap_ShareBasedCompensation | 6,826,000 us-gaap_ShareBasedCompensation
Impairment and acquisition related charges | 7,907,000 us-gaap_OtherNoncashExpense | 0 us-gaap_OtherNoncashExpense | 0 us-gaap_OtherNoncashExpense
Excess tax benefit on stock-based compensation plans | (3,776,000)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities | (6,201,000)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities | (3,297,000)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Non-cash stock charge | 0 epam_OtherNoncashStockCompensationCharge | 0 epam_OtherNoncashStockCompensationCharge | 640,000 epam_OtherNoncashStockCompensationCharge
Other | 735,000 us-gaap_OtherNoncashIncomeExpense | 1,199,000 us-gaap_OtherNoncashIncomeExpense | (66,000)us-gaap_OtherNoncashIncomeExpense
(Increase)/ decrease in operating assets: |  |  |
Accounts receivable | (30,410,000)us-gaap_IncreaseDecreaseInAccountsReceivable | (17,302,000)us-gaap_IncreaseDecreaseInAccountsReceivable | (12,664,000)us-gaap_IncreaseDecreaseInAccountsReceivable
Unbilled revenues | (11,134,000)us-gaap_IncreaseDecreaseInUnbilledReceivables | (9,833,000)us-gaap_IncreaseDecreaseInUnbilledReceivables | (6,905,000)us-gaap_IncreaseDecreaseInUnbilledReceivables
Prepaid expenses and other assets | 565,000 us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets | 587,000 us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets | (1,339,000)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Increase/ (decrease) in operating liabilities: |  |  |
Accounts payable | (2,603,000)us-gaap_IncreaseDecreaseInAccountsPayable | (2,900,000)us-gaap_IncreaseDecreaseInAccountsPayable | 1,407,000 us-gaap_IncreaseDecreaseInAccountsPayable
Accrued expenses and other liabilities | 11,492,000 us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities | 501,000 us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities | (5,825,000)us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities
Deferred revenues | (1,514,000)us-gaap_IncreaseDecreaseInDeferredRevenue | (2,325,000)us-gaap_IncreaseDecreaseInDeferredRevenue | (767,000)us-gaap_IncreaseDecreaseInDeferredRevenue
Due to employees | 7,453,000 us-gaap_IncreaseDecreaseInDueToEmployeesCurrent | 785,000 us-gaap_IncreaseDecreaseInDueToEmployeesCurrent | 2,896,000 us-gaap_IncreaseDecreaseInDueToEmployeesCurrent
Taxes payable | 16,868,000 us-gaap_IncreaseDecreaseInAccruedTaxesPayable | 3,074,000 us-gaap_IncreaseDecreaseInAccruedTaxesPayable | 5,498,000 us-gaap_IncreaseDecreaseInAccruedTaxesPayable
Net cash provided by operating activities | 104,874,000 us-gaap_NetCashProvidedByUsedInOperatingActivities | 58,225,000 us-gaap_NetCashProvidedByUsedInOperatingActivities | 48,499,000 us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities: |  |  |
Purchases of property and equipment | (11,916,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (13,360,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (13,376,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Payment for construction of corporate facilities | (3,924,000)us-gaap_PaymentsForConstructionInProcess | (2,560,000)us-gaap_PaymentsForConstructionInProcess | (13,701,000)us-gaap_PaymentsForConstructionInProcess
Employee housing loans | (1,740,000)us-gaap_PaymentsForProceedsFromOtherInvestingActivities | (7,982,000)us-gaap_PaymentsForProceedsFromOtherInvestingActivities | 0 us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Proceeds from repayments of employee housing loans | 1,793,000 us-gaap_ProceedsFromCollectionOfNotesReceivable | 2,189,000 us-gaap_ProceedsFromCollectionOfNotesReceivable | 0 us-gaap_ProceedsFromCollectionOfNotesReceivable
Decrease in restricted cash and time deposits, net | 1,430,000 us-gaap_IncreaseDecreaseInRestrictedCashAndInvestments | 429,000 us-gaap_IncreaseDecreaseInRestrictedCashAndInvestments | 470,000 us-gaap_IncreaseDecreaseInRestrictedCashAndInvestments
Increase in other long-term assets, net | (1,479,000)us-gaap_IncreaseDecreaseInOtherNoncurrentAssets | (516,000)us-gaap_IncreaseDecreaseInOtherNoncurrentAssets | (69,000)us-gaap_IncreaseDecreaseInOtherNoncurrentAssets
Acquisition of businesses, net of cash acquired (Note 2) | (37,093,000)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | (20,000)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | (32,951,000)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Net cash used in investing activities | (52,929,000)us-gaap_NetCashProvidedByUsedInInvestingActivities | (21,820,000)us-gaap_NetCashProvidedByUsedInInvestingActivities | (59,627,000)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities: |  |  |
Proceeds related to stock options exercises | 10,571,000 us-gaap_ProceedsFromStockOptionsExercised | 9,300,000 us-gaap_ProceedsFromStockOptionsExercised | 4,951,000 us-gaap_ProceedsFromStockOptionsExercised
Excess tax benefit on stock-based compensation plans | 3,776,000 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 6,201,000 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 3,297,000 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Net proceeds from issuance of common stock in initial public offering | 0 us-gaap_ProceedsFromIssuanceInitialPublicOffering | 0 us-gaap_ProceedsFromIssuanceInitialPublicOffering | 32,364,000 us-gaap_ProceedsFromIssuanceInitialPublicOffering
Costs related to stock issue | 0 us-gaap_PaymentsOfStockIssuanceCosts | 0 us-gaap_PaymentsOfStockIssuanceCosts | (1,765,000)us-gaap_PaymentsOfStockIssuanceCosts
Acquisition of business, deferred consideration | (4,000,000)epam_PaymentsToAcquireBusinessesDeferred | 0 epam_PaymentsToAcquireBusinessesDeferred | 0 epam_PaymentsToAcquireBusinessesDeferred
Net cash provided by financing activities | 10,347,000 us-gaap_NetCashProvidedByUsedInFinancingActivities | 15,501,000 us-gaap_NetCashProvidedByUsedInFinancingActivities | 38,847,000 us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of exchange rate changes on cash and cash equivalents | (10,965,000)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents | (811,000)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents | 1,597,000 us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net increase in cash and cash equivalents | 51,327,000 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 51,095,000 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 29,316,000 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of period | 169,207,000 us-gaap_CashAndCashEquivalentsAtCarryingValue | 118,112,000 us-gaap_CashAndCashEquivalentsAtCarryingValue | 88,796,000 us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of period | 220,534,000 us-gaap_CashAndCashEquivalentsAtCarryingValue | 169,207,000 us-gaap_CashAndCashEquivalentsAtCarryingValue | 118,112,000 us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosures of cash paid: |  |  |
Income taxes | 11,756,000 us-gaap_IncomeTaxesPaid | 10,207,000 us-gaap_IncomeTaxesPaid | 13,065,000 us-gaap_IncomeTaxesPaid
Bank interest | 7,000 us-gaap_InterestPaid | 26,000 us-gaap_InterestPaid | 14,000 us-gaap_InterestPaid
Deferred consideration payable | 1,022,000 epam_NonCashPayableDeferredConsideration | 0 epam_NonCashPayableDeferredConsideration | 0 epam_NonCashPayableDeferredConsideration
Contingent consideration payable | 36,322,000 epam_NonCashPayableContingentConsideration | 0 epam_NonCashPayableContingentConsideration | 0 epam_NonCashPayableContingentConsideration
Incurred but not paid costs | $ 0 us-gaap_CapitalExpendituresIncurredButNotYetPaid | $ 0 us-gaap_CapitalExpendituresIncurredButNotYetPaid | $ 96,000 us-gaap_CapitalExpendituresIncurredButNotYetPaid

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- Definition The net cash inflow or outflow during the period for the aggregate increase (decrease) associated with funds and investments that are not available for withdrawal or use (such as assets held in escrow or contractually limited as to use or disposition) and are associated with underlying transactions that are classified as investing activities. + References No definition available. + Details
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- Definition The increase (decrease) during the reporting period of the amount of revenue for work performed for which billing has not occurred, net of uncollectible accounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The amount of cash paid for interest during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3574-108585 + Details
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- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3574-108585 + Details
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- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.18) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.22) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 + Details
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- Definition Other expenses or losses included in net income that result in no cash outflows or inflows in the period and are not separately disclosed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Other income (expense) included in net income that results in no cash inflows or outflows in the period. Includes noncash adjustments to reconcile net income (loss) to cash provided by (used in) operating activities that are not separately disclosed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The cash outflow from construction costs to date on capital projects that have not been completed and assets being constructed that are not ready to be placed into service. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3095-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585 + Details
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- Definition The cash outflow for cost incurred directly with the issuance of an equity security. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash inflow associated with principal collections from a borrowing supported by a written promise to pay an obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The cash inflow associated with the amount received from entity's first offering of stock to the public. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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