XML 91 R77.htm IDEA: XBRL DOCUMENT v3.8.0.1

Fair Value of Financial Assets and Liabilities - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Abstract]
Fair value liabilities Level 2	$ 0

X

- 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