CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (Parenthetical) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) [Abstract]
Total incurred but not paid costs related to acquisition of Thoughtcorp	$ 0	$ 234

The fair value of liabilities assumed in noncash investing or financing activities.

No definition available.

Name:	epam_CostsIncurredRelatedToAcquisitionsButNotPaid
Namespace Prefix:	epam_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration