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Fair Value of Financial Assets and Liabilities - Additional Information (Detail) (USD $) | 3 Months Ended
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Mar. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] |
Fair value liabilities Level 2 | $ 0 plpc_FairValueLiabilitiesLevelTwoTransfersInAndOutAmount

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- Definition Fair value liabilities level two transfers in and out amount. + References No definition available. + Details
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Namespace Prefix: | plpc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration