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Long Lived Assets by Geographic Area (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Long-Lived Assets by Geographical Areas [Line Items]    
Long-lived assets $ 30,156us-gaap_PropertyPlantAndEquipmentNet $ 28,957us-gaap_PropertyPlantAndEquipmentNet
Long-lived assets percentage 100.00%pega_LongLivedAssetsPercentage 100.00%pega_LongLivedAssetsPercentage
U.S.    
Long-Lived Assets by Geographical Areas [Line Items]    
Long-lived assets 18,276us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_US		 21,282us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_US
Long-lived assets percentage 61.00%pega_LongLivedAssetsPercentage
/ us-gaap_StatementGeographicalAxis
= country_US		 74.00%pega_LongLivedAssetsPercentage
/ us-gaap_StatementGeographicalAxis
= country_US
India    
Long-Lived Assets by Geographical Areas [Line Items]    
Long-lived assets 8,943us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_IN		 4,645us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_IN
Long-lived assets percentage 29.00%pega_LongLivedAssetsPercentage
/ us-gaap_StatementGeographicalAxis
= country_IN		 16.00%pega_LongLivedAssetsPercentage
/ us-gaap_StatementGeographicalAxis
= country_IN
International, other    
Long-Lived Assets by Geographical Areas [Line Items]    
Long-lived assets $ 2,937us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= pega_OtherInternationalMember		 $ 3,030us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= pega_OtherInternationalMember
Long-lived assets percentage 10.00%pega_LongLivedAssetsPercentage
/ us-gaap_StatementGeographicalAxis
= pega_OtherInternationalMember		 10.00%pega_LongLivedAssetsPercentage
/ us-gaap_StatementGeographicalAxis
= pega_OtherInternationalMember