Document and Entity Information	9 Months Ended
	Sep. 30, 2014	Oct. 31, 2014
Document Documentand Entity Information [Abstract]
Entity Registrant Name	EPAM Systems, Inc.
Entity Central Index Key	0001352010
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		47,906,033
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q3
Document Period End Date	Sep. 30, 2014
Document Type	10-Q
Amendment Flag	false
Trading Symbol	EPAM