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Reconciliation of Effective Income Tax Rate from Statutory Federal Income Tax Rate (Detail)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Reconciliation of Effective Income Tax Rate [Line Items]      
Statutory federal income tax rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Valuation allowance 0.50%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance   (3.00%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Transaction costs   0.40%pega_EffectiveIncomeTaxRateReconciliationChangesDueToTransactionCostsIncurred  
State income taxes, net of federal benefit and tax credits 1.80%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 1.40%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes (0.80%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Permanent differences 1.30%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential 1.00%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential 1.70%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Domestic production activities (4.90%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities (3.80%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities (3.90%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities
Federal research and experimentation credits (1.70%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch (2.80%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch  
Tax effects of foreign activities (2.20%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlementsForeign (1.90%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlementsForeign (2.70%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlementsForeign
Tax-exempt income (0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome (0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome (0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome
Provision to return adjustments   0.80%us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes 0.60%us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes
Non-deductible compensation 2.50%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost 1.20%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost 1.50%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost
Provision for uncertain tax positions (0.70%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingenciesOther 1.50%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingenciesOther 2.80%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingenciesOther
Other (0.80%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (1.80%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective income tax rate 30.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations 32.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations 29.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations