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Pension Plans - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Pension And Other Employee Benefit Plans [Line Items]
Pretax curtailment gain			$ 6,300,000us-gaap_OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationBeforeTax
Pension liability			6,300,000us-gaap_IncreaseDecreaseInPensionPlanObligations
Estimated net loss for the PLP-USA pension plan	600,000us-gaap_DefinedBenefitPlanAmountToBeAmortizedFromAccumulatedOtherComprehensiveIncomeLossNextFiscalYear
Prior service cost	0us-gaap_DefinedBenefitPlanFutureAmortizationOfPriorServiceCostCredit
Pretax unfunded pension obligation loss	8,200,000us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax
Increased cost resulting from a 1% decline in the discount rate	5,100,000us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1
Expected long-term return on plan assets	8.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	8.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	8.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
Contribution to pension plan	0us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear
Expense for contribution plan	6,100,000us-gaap_DefinedContributionPlanCostRecognized	5,600,000us-gaap_DefinedContributionPlanCostRecognized	5,700,000us-gaap_DefinedContributionPlanCostRecognized
Weighted average of one year treasury bill	1.00%plpc_SupplementalProfitSharingPlanVariableRateBasis
Interest rate for the supplemental profit sharing plan	1.12%plpc_SupplementalProfitSharingPlanInterestRate	1.15%plpc_SupplementalProfitSharingPlanInterestRate
Expense for the supplemental profit sharing plan	500,000plpc_RetirementAndProfitSharingPlanExpenses	300,000plpc_RetirementAndProfitSharingPlanExpenses	400,000plpc_RetirementAndProfitSharingPlanExpenses
Supplemental profit sharing plan unfunded status	3,500,000plpc_DefinedBenefitPlanUnfundedStatusOfPlan	3,000,000plpc_DefinedBenefitPlanUnfundedStatusOfPlan
Additional Loss [Member]
Pension And Other Employee Benefit Plans [Line Items]
Pretax unfunded pension obligation loss	$ 2,900,000us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax / us-gaap_IncomeStatementLocationAxis = plpc_AdditionalLossMember

X

- Definition

Defined benefit plan unfunded status of plan.

+ References

No definition available.

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- Definition

Retirement and profit sharing plan expenses.

+ References

No definition available.

+ Details

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- Definition

Supplemental profit sharing plan interest rate.

+ References

No definition available.

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- Definition

Supplemental profit sharing plan variable rate basis.

+ References

No definition available.

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- Definition

Amount before tax, after reclassification adjustments, of actuarial gain (loss) that has not been recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (i)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 10A

-Subparagraph (i)

-URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580

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- Definition

Amount included in accumulated other comprehensive income (AOCI) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position, including gain (loss), prior service cost (credit), and transition asset (obligation).

+ References

No definition available.

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- Definition

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Glossary Expected Long-Term Rate of Return on Plan Assets

-URI http://asc.fasb.org/extlink&oid=6512013



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- Definition

Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Topic 715

-SubTopic 20

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- Definition

Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

+ References

No definition available.

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- Definition

Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position.

+ References

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- Definition

The amount of the cost recognized during the period for defined contribution plans.

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-Topic 715

-SubTopic 70

-Section 50

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- Definition

The increase (decrease) during the reporting period in the amount due to fund retirement benefits to employees, retired and disabled former employees.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Amount before tax of gain (loss) adjustment to other comprehensive income (loss) resulting from settlement or curtailment of defined benefit pension and other postretirement defined benefit plans.

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