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Income Taxes - Tax Effects of Temporary Differences That Give Rise to the Company's Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Tax Disclosure [Abstract] |  |  |
Accrued compensation and benefits | $ 1,358 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits | $ 1,463 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits |
Inventory valuation reserves | 2,849 us-gaap_DeferredTaxAssetsInventory | 2,581 us-gaap_DeferredTaxAssetsInventory |
Benefit plan reserves | 11,331 plpc_DeferredTaxAssetsTaxDeferredExpensePensionShareBasedAndOtherEmployeeBenefits | 7,773 plpc_DeferredTaxAssetsTaxDeferredExpensePensionShareBasedAndOtherEmployeeBenefits |
Net operating loss carryforwards | 2,751 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 1,244 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards |
Tax credit carryforwards | 745 us-gaap_DeferredTaxAssetsTaxCreditCarryforwards | 0 us-gaap_DeferredTaxAssetsTaxCreditCarryforwards |
Other accrued expenses | 2,542 us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther | 2,926 us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther |
Unrealized foreign exchange | 1,805 plpc_DeferredTaxAssetsUnrealizedForeignExchange | 743 plpc_DeferredTaxAssetsUnrealizedForeignExchange |
Gross deferred tax assets | 23,381 us-gaap_DeferredTaxAssetsGross | 16,730 us-gaap_DeferredTaxAssetsGross |
Valuation allowance | (3,614)us-gaap_DeferredTaxAssetsValuationAllowance | (1,420)us-gaap_DeferredTaxAssetsValuationAllowance |
Net deferred tax assets | 19,767 us-gaap_DeferredTaxAssetsNet | 15,310 us-gaap_DeferredTaxAssetsNet |
Depreciation and other basis differences | (5,814)plpc_DeferredTaxLiabilitiesDeferredExpenseDepreciationAndAmortization | (5,533)plpc_DeferredTaxLiabilitiesDeferredExpenseDepreciationAndAmortization |
Intangibles | (3,706)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets | (2,828)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets |
Undistributed foreign earnings | (444)us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings | (61)us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings |
Other | (65)us-gaap_DeferredTaxLiabilitiesOther | (71)us-gaap_DeferredTaxLiabilitiesOther |
Deferred tax liabilities | (10,029)us-gaap_DeferredTaxLiabilities | (8,493)us-gaap_DeferredTaxLiabilities |
Net deferred tax assets | 9,738 us-gaap_DeferredTaxAssetsLiabilitiesNet | 6,817 us-gaap_DeferredTaxAssetsLiabilitiesNet |
Deferred income tax benefit | 1,697 us-gaap_DeferredIncomeTaxExpenseBenefit | 1,105 us-gaap_DeferredIncomeTaxExpenseBenefit | 2,927 us-gaap_DeferredIncomeTaxExpenseBenefit
Items of other comprehensive income (loss) | 3,108 us-gaap_DeferredTaxAssetsOtherComprehensiveLoss | (2,692)us-gaap_DeferredTaxAssetsOtherComprehensiveLoss |
Currency translation | 141 plpc_DeferredTaxAssetsUnrealizedCurrencyGainLoss | 263 plpc_DeferredTaxAssetsUnrealizedCurrencyGainLoss |
Deferred tax balances from business acquisition | (2,025)plpc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredtaxAssetsLiabilitiesNoncurrent | 0 plpc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredtaxAssetsLiabilitiesNoncurrent |
Total change in net deferred tax assets | $ 2,921 plpc_IncreaseDecreaseInNetDeferredTaxAssets | $ (1,324)plpc_IncreaseDecreaseInNetDeferredTaxAssets |

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- Definition Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section I -Subsection 7 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6510177 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition The tax effect as of the balance sheet date of the amount of future tax deductions arising from all unused tax credit carryforwards which have been reduced by a valuation allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Carryforwards -URI http://asc.fasb.org/extlink&oid=6506874 + Details
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- Definition The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from employee benefit costs not otherwise specified in the taxonomy, which can only be deducted for tax purposes when actual costs are incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from other provisions, reserves, allowances, and accruals not separately disclosed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Asset -URI http://asc.fasb.org/extlink&oid=6510090 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences net of deferred tax asset attributable to deductible temporary differences and carryforwards after valuation allowances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31931-109318 + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences from intangible assets other than goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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