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Share-Based Compensation - Activity in Company's Plan - Long Term Incentive Plan (Detail) (Long Term Incentive Plan Stock Option [Member], USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Long Term Incentive Plan Stock Option [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding at January 1, 2015, Number of Shares 47,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ 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
Exercised, Number of Shares 0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_PlanNameAxis
= plpc_LongTermIncentivePlanStockOptionMember
1,250us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_PlanNameAxis
= plpc_LongTermIncentivePlanStockOptionMember
Forfeited, Number of Shares 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
/ us-gaap_PlanNameAxis
= plpc_LongTermIncentivePlanStockOptionMember
 
Outstanding (vested and expected to vest) at March 31, 2015, Number of Shares 47,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
/ us-gaap_PlanNameAxis
= plpc_LongTermIncentivePlanStockOptionMember
 
Exercisable at March 31, 2015, Number of Shares 20,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_PlanNameAxis
= plpc_LongTermIncentivePlanStockOptionMember
 
Outstanding at January 1, 2015, Weighted Average Exercise Price per Share $ 58.11us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= plpc_LongTermIncentivePlanStockOptionMember
 
Granted, Weighted Average Exercise Price per Share $ 0.00us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= plpc_LongTermIncentivePlanStockOptionMember
 
Exercised, Weighted Average Exercise Price per Share $ 0.00us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= plpc_LongTermIncentivePlanStockOptionMember
 
Forfeited, Weighted Average Exercise Price per Share $ 0.00us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= plpc_LongTermIncentivePlanStockOptionMember
 
Outstanding (vested and expected to vest) at March 31, 2015, Weighted Average Exercise Price per Share $ 58.11us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= plpc_LongTermIncentivePlanStockOptionMember
 
Exercisable at March 31, 2015, Weighted Average Exercise Price per Share $ 60.32us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= plpc_LongTermIncentivePlanStockOptionMember
 
Outstanding (vested and expected to vest) at March 31, 2015, Weighted Average Remaining Contractual Term 8 years 7 months 6 days  
Exercisable at March 31, 2015, Weighted Average Remaining Contractual Term 7 years 6 months  
Outstanding (vested and expected to vest) at March 31, 2015, Aggregate Intrinsic Value $ 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue
/ us-gaap_PlanNameAxis
= plpc_LongTermIncentivePlanStockOptionMember
 
Exercisable at March 31, 2015, Aggregate Intrinsic Value $ 0us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_PlanNameAxis
= plpc_LongTermIncentivePlanStockOptionMember