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Pension Plans - Fair Value of the Company's Plan Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Assets measured at net asset value | $ 36,756 | $ 32,658
Pooled Investment Fund [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Assets measured at net asset value | $ 36,756 | $ 32,658

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- Definition Defined benefit plan assets net asset value. + References No definition available. + Details
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Namespace Prefix: | plpc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_MutualFundMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |