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

X

- Definition

Number of major customers accounted for revenue.

+ References

No definition available.

+ Details

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X

- 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

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X

- 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

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X

- 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

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