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Segment Information - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 Customer Segment | Dec. 31, 2013 | Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Number of reportable segment | 4 us-gaap_NumberOfReportableSegments |  |
Number of major customers accounted for revenue | 0 plpc_NumberOfMajorCustomersAccountedForRevenue |  |
Net sales | $ 388,185 us-gaap_SalesRevenueGoodsNet | $ 409,776 us-gaap_SalesRevenueGoodsNet | $ 439,192 us-gaap_SalesRevenueGoodsNet
UNITED STATES |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net sales | 152,600 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_US | 163,000 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_US | 179,400 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_US
Long-lived assets | $ 41,100 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US | $ 38,400 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US |

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- Definition Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599 + Details
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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- Definition Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(a)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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