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Fair Value of Financial Assets and Liabilities - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2017 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract]
Fair value liabilities Level 2	$ 0

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- Definition

Fair value liabilities level two transfers in and out amount.

+ References

No definition available.

+ Details

Name:	plpc_FairValueLiabilitiesLevelTwoTransfersInAndOutAmount
Namespace Prefix:	plpc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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