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Leases - Summary of Supplemental Cash Flow Information Related to Leases (Detail) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019
Cash paid for amounts included in the measurement of lease liabilities: |  |
Operating cash flows from operating and financing leases | $ 2,100 | $ 4,618
Financing cash flows from finance leases | $ 87 | $ 74

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- Definition Cash paid for amounts included in the measurement of lease liabilities. + References No definition available. + Details
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Namespace Prefix: | plpc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Operating cash flows from operating and financing leases. + References No definition available. + Details
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Namespace Prefix: | plpc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Amount of cash outflow for principal payment on finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918643-209977 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 + Details
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