Geographic Information and Major Customers - Additional Information (Detail)	6 Months Ended
Jun. 30, 2012
Revenue, Major Customer [Line Items]
Major customer percentage	10.00%

Entity-Wide Revenue, Criteria for Major Customer, Percentage of Revenue

No definition available.

Name:	pega_EntityWideRevenueCriteriaForMajorCustomerPercentageOfRevenue
Namespace Prefix:	pega_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration