GENERAL (Details)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
GENERAL [Abstract]
Percentage of total revenue from one major customer	63.00%	67.00%	70.00%
Total trade receivables from one major customer	72.00%	68.00%

Percentage of trade receivables generated from a single external customer that accounts for 10 percent or more of an entity's receivables.

No definition available.

Name:	peri_EntityWideTradeReceivablesMajorCustomerPercentage
Namespace Prefix:	peri_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration