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Leases - Summary of Supplemental Cash Flow Information Related to Leases (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating and financing leases	$ 1,346	$ 3,682
Financing cash flows from finance leases	$ 57	$ 49

X

- 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

X

- Definition

Operating cash flows from operating and financing leases.

+ References

No definition available.

+ Details

Name:	plpc_OperatingCashFlowsFromOperatingAndFinancingLeases
Namespace Prefix:	plpc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- 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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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	duration