XML 53 R36.htm IDEA: XBRL DOCUMENT
v3.7.0.1

STOCK-BASED COMPENSATION - Restricted Stock and Restricted Stock Units Additional Information (Details) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 USD ($)
Acquisition-related Awards |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting period (in years) | 3 years
Service Period | Equity Classified Award | Equity-Settled Award | Restricted Stock |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Unrecognized compensation expense | $ 1,783
Weighted average period for recognition of unrecognized compensation expense (in years) | 1 year 21 days
Service Period | Equity Classified Award | Equity-Settled Award | Restricted Stock Units |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Unrecognized compensation expense | $ 45,693
Weighted average period for recognition of unrecognized compensation expense (in years) | 2 years 2 months 14 days
Service Period | Liability Classified Award | Cash-Settled Award | Restricted Stock Units |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Unrecognized compensation expense | $ 19,842
Weighted average period for recognition of unrecognized compensation expense (in years) | 2 years 2 months 17 days
Performance Target | Equity Classified Award | Equity-Settled Award | Restricted Stock |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Unrecognized compensation expense | $ 89
Weighted average period for recognition of unrecognized compensation expense (in years) | 1 year
Performance Target | Equity Classified Award | Equity-Settled Award | Restricted Stock Units |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Unrecognized compensation expense | $ 389
Weighted average period for recognition of unrecognized compensation expense (in years) | 1 year 1 month 26 days
Performance Target | Liability Classified Award | Equity-Settled Award | Restricted Stock |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Unrecognized compensation expense | $ 1,221
Performance Target | Liability Classified Award | Equity-Settled Award | Restricted Stock Units |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Weighted average period for recognition of unrecognized compensation expense (in years) | 1 year
Year One | Acquisition-related Awards |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting percentage | 33.30%
Year Two | Acquisition-related Awards |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting percentage | 33.30%
Year Three | Acquisition-related Awards |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting percentage | 33.30%

X
- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References No definition available. + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of vesting of share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AwardTypeAxis=epam_AcquisitionrelatedAwardsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | epam_AwardMetricAxis=epam_ServicePeriodMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | epam_AwardClassificationAxis=epam_EquityClassifiedAwardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | epam_AwardSettlementTypeAxis=epam_EquitySettledAwardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | epam_AwardClassificationAxis=epam_LiabilityClassifiedAwardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | epam_AwardSettlementTypeAxis=epam_CashSettledAwardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | epam_AwardMetricAxis=epam_PerformanceTargetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VestingAxis=us-gaap_ShareBasedCompensationAwardTrancheOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VestingAxis=us-gaap_ShareBasedCompensationAwardTrancheTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VestingAxis=us-gaap_ShareBasedCompensationAwardTrancheThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |