Name:	pega_RestrictedStockUnitesGrantedCorporateIncentiveCompensationPlan
Namespace Prefix:	pega_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

The period over which stock-based compensation expense will be recognized for RSUs issued in connection with the Company's CICP.

No definition available.

Name:	pega_ShareBasedCompensationArrangementByShareBasedPaymentAwardCompensationCostsRecognitionPeriod
Namespace Prefix:	pega_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Percentage of an employee's annual target incentive compensation which is eligible to be elected and received in the form of RSUs in accordance with the Company's CICP.

No definition available.

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

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585