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Share-Based Compensation - Additional Information (Detail) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Excess tax benefits from restricted share awards $ 20,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities $ 160,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities  
Deferred shares and held by the rabbi trust 289,942plpc_CommonStockSharesHeldInEmployeeTrustShare   292,609plpc_CommonStockSharesHeldInEmployeeTrustShare
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercised, Number of Shares 0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Compensation expenses 0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Common shares reserved for awards 100,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
   
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common shares reserved for awards 800,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
   
Shares remaining to be issued 327,398us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
   
Restricted Stock Units (RSUs) [Member] | Chief Executive Officer [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share based compensation arrangement share based payment award vesting period 3 years    
Time-Based RSUs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expenses 100,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= plpc_TimeBasedRestrictedStockUnitsRSUMember
100,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= plpc_TimeBasedRestrictedStockUnitsRSUMember
 
Compensation cost expected to be recognized over period 600,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= plpc_TimeBasedRestrictedStockUnitsRSUMember
   
Weighted-average period 2 years    
Maximum [Member] | Performance-Based Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Excess tax benefits from restricted share awards 100,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
/ us-gaap_AwardTypeAxis
= plpc_PerformanceBasedRestrictedStockMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
200,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
/ us-gaap_AwardTypeAxis
= plpc_PerformanceBasedRestrictedStockMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Long Term Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common shares reserved for awards 900,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= plpc_LongTermIncentivePlanMember
   
LTIP expiry date Apr. 17, 2018    
Long Term Incentive Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common shares reserved for awards 100,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= plpc_LongTermIncentiveStockOptionMember
   
Shares remaining to be issued 21,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= plpc_LongTermIncentiveStockOptionMember
   
Long Term Incentive Stock Option [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Option issued under plan vest and expire 10 years    
Long Term Incentive Stock Option [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Option issued under plan vest and expire 5 years    
Long Term Incentive Plan Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercised, Number of Shares 0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_PlanNameAxis
= plpc_LongTermIncentivePlanStockOptionMember
1,250us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_PlanNameAxis
= plpc_LongTermIncentivePlanStockOptionMember
 
Compensation expenses 100,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= plpc_LongTermIncentivePlanStockOptionMember
100,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= plpc_LongTermIncentivePlanStockOptionMember
 
Weighted-average period 2 years 2 months 12 days    
Option issued under plan vest 50.00%plpc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestPercentageAfterOneYear
/ us-gaap_PlanNameAxis
= plpc_LongTermIncentivePlanStockOptionMember
   
Option issued under plan vest and granted after 2 years 75.00%plpc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestPercentageAfterTwoYear
/ us-gaap_PlanNameAxis
= plpc_LongTermIncentivePlanStockOptionMember
   
Option issued under plan vest and granted after 3 years 100.00%plpc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestPercentageAfterThreeYear
/ us-gaap_PlanNameAxis
= plpc_LongTermIncentivePlanStockOptionMember
   
Estimated Forfeitures 0us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationForfeited
/ us-gaap_PlanNameAxis
= plpc_LongTermIncentivePlanStockOptionMember
   
Granted, Number of Shares 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= plpc_LongTermIncentivePlanStockOptionMember
17,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= plpc_LongTermIncentivePlanStockOptionMember
 
Weighted average grant date fair value options granted   $ 25.79us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= plpc_LongTermIncentivePlanStockOptionMember
 
Cash received for the exercise of stock options awards 0us-gaap_ProceedsFromStockOptionsExercised
/ us-gaap_PlanNameAxis
= plpc_LongTermIncentivePlanStockOptionMember
100,000us-gaap_ProceedsFromStockOptionsExercised
/ us-gaap_PlanNameAxis
= plpc_LongTermIncentivePlanStockOptionMember
 
Expected compensation cost related to unvested awards not yet recognized 400,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_PlanNameAxis
= plpc_LongTermIncentivePlanStockOptionMember
   
Long Term Incentive Plan Stock Option [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total intrinsic value of stock options 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_PlanNameAxis
= plpc_LongTermIncentivePlanStockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_PlanNameAxis
= plpc_LongTermIncentivePlanStockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Deferred Compensation Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of deferrals 2plpc_ShareBasedCompensationNumberOfDeferrals
/ us-gaap_PlanNameAxis
= plpc_DeferredCompensationPlanMember
   
Performance-Based RSUs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost expected to be recognized over period 3,600,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_PlanNameAxis
= plpc_PerformanceBasedRestrictedStockUnitsRsuMember
   
Weighted-average period 2 years 3 months 18 days    
Performance-based compensation expense 400,000us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
/ us-gaap_PlanNameAxis
= plpc_PerformanceBasedRestrictedStockUnitsRsuMember
600,000us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
/ us-gaap_PlanNameAxis
= plpc_PerformanceBasedRestrictedStockUnitsRsuMember
 
Performance-Based RSUs [Member] | Performance Based RSU Grant 2013 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance-based compensation expense 400,000us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
/ us-gaap_AwardDateAxis
= plpc_PerformanceBasedRsuGrantTwoThousandThirteenMember
/ us-gaap_PlanNameAxis
= plpc_PerformanceBasedRestrictedStockUnitsRsuMember
   
Performance-Based RSUs [Member] | Performance Based RSU Grant 2014 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance-based compensation expense $ 400,000us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
/ us-gaap_AwardDateAxis
= plpc_PerformanceBasedRsuGrantTwoThousandFourteenMember
/ us-gaap_PlanNameAxis
= plpc_PerformanceBasedRestrictedStockUnitsRsuMember