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Income Taxes Components of Deferred Tax Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Bad debt reserve $ 13us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts $ 13us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Vacation accrual 685us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsCompensatedAbsences 1,020us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsCompensatedAbsences
Nonqualified stock options 3,059pfmt_DeferredTaxAssetsNonqualifiedStockOptions 1,526pfmt_DeferredTaxAssetsNonqualifiedStockOptions
Debt issuance costs 643pfmt_DeferredTaxAssetsDebtIssuanceCosts 848pfmt_DeferredTaxAssetsDebtIssuanceCosts
Acquisition costs 630pfmt_DeferredTaxAssetsAcquisitionCosts 158pfmt_DeferredTaxAssetsAcquisitionCosts
State tax deferral 934us-gaap_DeferredTaxAssetsStateTaxes 1,474us-gaap_DeferredTaxAssetsStateTaxes
Deferred revenue 273us-gaap_DeferredTaxAssetsDeferredIncome 352us-gaap_DeferredTaxAssetsDeferredIncome
State tax credits 305pfmt_DeferredTaxAssetsTaxCreditCarryForwardsStateTaxCredits 290pfmt_DeferredTaxAssetsTaxCreditCarryForwardsStateTaxCredits
Net operating loss 110us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 47us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Estimated liability for appeals 5,313us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsContingencies 4,277us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsContingencies
Other 304us-gaap_DeferredTaxAssetsOther 118us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 12,269us-gaap_DeferredTaxAssetsGross 10,123us-gaap_DeferredTaxAssetsGross
Valuation allowance (349)us-gaap_DeferredTaxAssetsValuationAllowance (147)us-gaap_DeferredTaxAssetsValuationAllowance
Total deferred tax assets net of valuation allowance 11,920us-gaap_DeferredTaxAssetsNet 9,976us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities:    
Identifiable intangible assets (10,227)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (11,176)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Fixed assets (5,732)pfmt_DeferredTaxLiabilitiesTaxDepreciationInExcessOfBook (4,543)pfmt_DeferredTaxLiabilitiesTaxDepreciationInExcessOfBook
Other (22)us-gaap_DeferredTaxLiabilitiesOther (22)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities (15,981)us-gaap_DeferredTaxLiabilities (15,741)us-gaap_DeferredTaxLiabilities
Net deferred tax liabilities $ (4,061)us-gaap_DeferredTaxAssetsLiabilitiesNet $ (5,765)us-gaap_DeferredTaxAssetsLiabilitiesNet