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Income Taxes - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Contingency [Line Items]        
Valuation allowance, net increase (decrease) $ 500,000us-gaap_ValuationAllowancesAndReservesPeriodIncreaseDecrease      
Deferred Tax Assets, Operating Loss Carry forwards, State and Local 700,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal      
Reduction of income tax provision due to tax holidays 800,000us-gaap_IncomeTaxHolidayAggregateDollarAmount 500,000us-gaap_IncomeTaxHolidayAggregateDollarAmount 500,000us-gaap_IncomeTaxHolidayAggregateDollarAmount  
Tax holiday expiration date 2022      
Net income per share of the benefit tax holiday $ 0.01us-gaap_IncomeTaxHolidayIncomeTaxBenefitsPerShare $ 0.01us-gaap_IncomeTaxHolidayIncomeTaxBenefitsPerShare $ 0.01us-gaap_IncomeTaxHolidayIncomeTaxBenefitsPerShare  
Reduction of income tax payable 3,100,000pega_ReductionInTaxesPayableAsResultOfExerciseAndVestingOfEquityBasedCompensation      
Undistributed earnings of foreign subsidiaries 44,700,000us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings      
Unrecognized Tax Benefits 43,396,000us-gaap_UnrecognizedTaxBenefits 40,929,000us-gaap_UnrecognizedTaxBenefits 26,317,000us-gaap_UnrecognizedTaxBenefits 25,312,000us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits that would decrease effective tax rate if recognized 23,400,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate      
Expected changes in unrecognized tax benefits in next 12 months that would reduce effective tax rate 500,000pega_EstimatedChangesInUnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRateIfRecognized      
Recognized interest expense 300,000us-gaap_IncomeTaxExaminationInterestExpense 300,000us-gaap_IncomeTaxExaminationInterestExpense 100,000us-gaap_IncomeTaxExaminationInterestExpense  
Accrued interest and penalties 1,500,000us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued 1,100,000us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued    
Tax open years for all other jurisdictions 2009 to the present      
Tax Year 2011        
Income Tax Contingency [Line Items]        
Year under federal income tax returns examination 2011      
Tax Year 2012        
Income Tax Contingency [Line Items]        
Year under federal income tax returns examination 2012      
Tax Year 2013        
Income Tax Contingency [Line Items]        
Year under federal income tax returns examination 2013      
Chordiant Software, Inc.        
Income Tax Contingency [Line Items]        
Federal net operating losses utilized in acquisition 90,000,000pega_BusinessAcquisitionFederalNetOperatingLossesUtilizable
/ us-gaap_BusinessAcquisitionAxis
= pega_ChordiantSoftwareIncMember		      
Federal net operating losses, date through which is subject to annual limitations 2029      
Antenna        
Income Tax Contingency [Line Items]        
Net operating losses 39,300,000us-gaap_OperatingLossCarryforwards
/ us-gaap_BusinessAcquisitionAxis
= pega_AntennaSoftwareIncMember		      
Federal and foreign net operating losses utilized in acquisition 7,500,000pega_BusinessAcquisitionNetOperatingLossesUtilizableInAcquisition
/ us-gaap_BusinessAcquisitionAxis
= pega_AntennaSoftwareIncMember		      
Net operating losses expiration year 2031      
Federal net operating losses utilized in acquisition 7,100,000pega_BusinessAcquisitionFederalNetOperatingLossesUtilizable
/ us-gaap_BusinessAcquisitionAxis
= pega_AntennaSoftwareIncMember		      
Antenna | Net Operating Losses        
Income Tax Contingency [Line Items]        
Valuation allowance, net increase (decrease)   24,000,000us-gaap_ValuationAllowancesAndReservesPeriodIncreaseDecrease
/ us-gaap_BusinessAcquisitionAxis
= pega_AntennaSoftwareIncMember
/ us-gaap_IncomeStatementLocationAxis
= pega_NetOperatingLossesMember		    
Federal | Chordiant Software, Inc.        
Income Tax Contingency [Line Items]        
Net operating losses 115,800,000us-gaap_OperatingLossCarryforwards
/ us-gaap_BusinessAcquisitionAxis
= pega_ChordiantSoftwareIncMember
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		      
Federal | Antenna        
Income Tax Contingency [Line Items]        
Net operating losses 39,600,000us-gaap_OperatingLossCarryforwards
/ us-gaap_BusinessAcquisitionAxis
= pega_AntennaSoftwareIncMember
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		      
State        
Income Tax Contingency [Line Items]        
Tax research and experimentation 6,200,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		      
Tax credits 500,000us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		      
Tax credits expiration date 2015 through 2029      
Acquired Net Operating Losses And Research Tax Credit        
Income Tax Contingency [Line Items]        
Unrecognized tax benefits that would decrease effective tax rate if recognized 20,000,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
/ us-gaap_IncomeTaxAuthorityAxis
= pega_AcquiredNetOperatingLossesAndResearchTaxCreditMember		      
Foreign | Antenna        
Income Tax Contingency [Line Items]        
Net operating losses $ 58,100,000us-gaap_OperatingLossCarryforwards
/ us-gaap_BusinessAcquisitionAxis
= pega_AntennaSoftwareIncMember
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember