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v3.19.2

DEFERRED CONTRACT COSTS - Additional Information (Details) | 6 Months Ended
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Jun. 30, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |
Amortized period | 5 years

X
- Definition Average amortization period for deferred contract costs. + References No definition available. + Details
Name: | pega_AmortizationPeriodForDeferredContactCosts
Namespace Prefix: | pega_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration