Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2016	Oct. 31, 2016
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	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		51,035,929
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q3
Document Period End Date	Sep. 30, 2016
Document Type	10-Q
Amendment Flag	false
Trading Symbol	EPAM