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Income Taxes - Differences Between the Provision for Income Taxes at the U.S. Federal Statutory Rate and the Tax (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
U. S. federal statutory tax rate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Federal tax at statutory rate	$ 7,494us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 11,128us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 15,689us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State and local taxes, net of federal benefit	290us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	583us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	485us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
U.S. federal permanent items	208plpc_IncomeTaxReconciliationUsFederalPermanentItems	124plpc_IncomeTaxReconciliationUsFederalPermanentItems	332plpc_IncomeTaxReconciliationUsFederalPermanentItems
Domestic production activities deduction	(536)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities	(372)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities	(669)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities
Foreign earnings and related tax credits	700plpc_IncomeTaxReconciliationRepatriationOfEarningsAndRelatedTaxCreditsForeign	701plpc_IncomeTaxReconciliationRepatriationOfEarningsAndRelatedTaxCreditsForeign	1,377plpc_IncomeTaxReconciliationRepatriationOfEarningsAndRelatedTaxCreditsForeign
Non-U.S. tax rate variances	(1,313)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	(1,467)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	(1,175)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Unrecognized tax benefits	186plpc_IncomeTaxReconciliationUnrecognizedTaxBenefitsNet	(770)plpc_IncomeTaxReconciliationUnrecognizedTaxBenefitsNet	310plpc_IncomeTaxReconciliationUnrecognizedTaxBenefitsNet
Valuation allowance	1,925us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	1,091us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	(337)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Tax credits	(184)us-gaap_IncomeTaxReconciliationTaxCredits	(453)us-gaap_IncomeTaxReconciliationTaxCredits	(85)us-gaap_IncomeTaxReconciliationTaxCredits
Other, net	(221)us-gaap_IncomeTaxReconciliationOtherReconcilingItems	642us-gaap_IncomeTaxReconciliationOtherReconcilingItems	(386)us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Income taxes	$ 8,549us-gaap_IncomeTaxExpenseBenefit	$ 11,207us-gaap_IncomeTaxExpenseBenefit	$ 15,541us-gaap_IncomeTaxExpenseBenefit

X

- Definition

The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to repatriation of foreign earnings and foreign tax credits generated or utilized under enacted tax laws during the period.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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Amount of the difference between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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