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Income Taxes - Tax Effects of Temporary Differences That Give Rise to the Company's Deferred Tax Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Accrued compensation and benefits $ 1,358us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits $ 1,463us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits  
Inventory valuation reserves 2,849us-gaap_DeferredTaxAssetsInventory 2,581us-gaap_DeferredTaxAssetsInventory  
Benefit plan reserves 11,331plpc_DeferredTaxAssetsTaxDeferredExpensePensionShareBasedAndOtherEmployeeBenefits 7,773plpc_DeferredTaxAssetsTaxDeferredExpensePensionShareBasedAndOtherEmployeeBenefits  
Net operating loss carryforwards 2,751us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 1,244us-gaap_DeferredTaxAssetsOperatingLossCarryforwards  
Tax credit carryforwards 745us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 0us-gaap_DeferredTaxAssetsTaxCreditCarryforwards  
Other accrued expenses 2,542us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther 2,926us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther  
Unrealized foreign exchange 1,805plpc_DeferredTaxAssetsUnrealizedForeignExchange 743plpc_DeferredTaxAssetsUnrealizedForeignExchange  
Gross deferred tax assets 23,381us-gaap_DeferredTaxAssetsGross 16,730us-gaap_DeferredTaxAssetsGross  
Valuation allowance (3,614)us-gaap_DeferredTaxAssetsValuationAllowance (1,420)us-gaap_DeferredTaxAssetsValuationAllowance  
Net deferred tax assets 19,767us-gaap_DeferredTaxAssetsNet 15,310us-gaap_DeferredTaxAssetsNet  
Depreciation and other basis differences (5,814)plpc_DeferredTaxLiabilitiesDeferredExpenseDepreciationAndAmortization (5,533)plpc_DeferredTaxLiabilitiesDeferredExpenseDepreciationAndAmortization  
Intangibles (3,706)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (2,828)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets  
Undistributed foreign earnings (444)us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings (61)us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings  
Other (65)us-gaap_DeferredTaxLiabilitiesOther (71)us-gaap_DeferredTaxLiabilitiesOther  
Deferred tax liabilities (10,029)us-gaap_DeferredTaxLiabilities (8,493)us-gaap_DeferredTaxLiabilities  
Net deferred tax assets 9,738us-gaap_DeferredTaxAssetsLiabilitiesNet 6,817us-gaap_DeferredTaxAssetsLiabilitiesNet  
Deferred income tax benefit 1,697us-gaap_DeferredIncomeTaxExpenseBenefit 1,105us-gaap_DeferredIncomeTaxExpenseBenefit 2,927us-gaap_DeferredIncomeTaxExpenseBenefit
Items of other comprehensive income (loss) 3,108us-gaap_DeferredTaxAssetsOtherComprehensiveLoss (2,692)us-gaap_DeferredTaxAssetsOtherComprehensiveLoss  
Currency translation 141plpc_DeferredTaxAssetsUnrealizedCurrencyGainLoss 263plpc_DeferredTaxAssetsUnrealizedCurrencyGainLoss  
Deferred tax balances from business acquisition (2,025)plpc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredtaxAssetsLiabilitiesNoncurrent 0plpc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredtaxAssetsLiabilitiesNoncurrent  
Total change in net deferred tax assets $ 2,921plpc_IncreaseDecreaseInNetDeferredTaxAssets $ (1,324)plpc_IncreaseDecreaseInNetDeferredTaxAssets