Number of trading days to be considered for average price of stock repurchased.

No definition available.

Name:	plpc_PeriodToBeConsideredForAveragePriceOfStockRepurchased
Namespace Prefix:	plpc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Related party employee years of service.

+ References

No definition available.

+ Details

Name:	plpc_RelatedPartyEmployeeTermOfService
Namespace Prefix:	plpc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Related party ownership percentage.

+ References

No definition available.

+ Details

Name:	plpc_RelatedPartyOwnershipPercentage
Namespace Prefix:	plpc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Related party transaction labor expense.

+ References

No definition available.

+ Details

Name:	plpc_RelatedPartyTransactionLaborExpense
Namespace Prefix:	plpc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Related party transaction lease expenses.

+ References

No definition available.

+ Details

Name:	plpc_RelatedPartyTransactionLeaseExpenses
Namespace Prefix:	plpc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Related party transaction rent expense.

+ References

No definition available.

+ Details

Name:	plpc_RelatedPartyTransactionRentExpense
Namespace Prefix:	plpc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Related party transaction reportable compensation payment.

+ References

No definition available.

+ Details

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

- Definition

Related party transaction share based compensation.

+ References

No definition available.

+ Details

Name:	plpc_RelatedPartyTransactionShareBasedCompensation
Namespace Prefix:	plpc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Related party transactions number of property leased.

+ References

No definition available.

+ Details

Name:	plpc_RelatedPartyTransactionsNumberOfPropertyLeased
Namespace Prefix:	plpc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Related party transactions number of property rented.

+ References

No definition available.

+ Details

Name:	plpc_RelatedPartyTransactionsNumberOfPropertyRented
Namespace Prefix:	plpc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Stock repurchased during period price per share.

+ References

No definition available.

+ Details

Name:	plpc_StockRepurchasedDuringPeriodPricePerShare
Namespace Prefix:	plpc_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

+ Details

Name:	us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

+ Details

Name:	us-gaap_StockRepurchasedDuringPeriodShares
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=plpc_CarolineVaccarielloMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=plpc_CecilCurleeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=plpc_DavidSunkleMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=plpc_DennisMckennaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=plpc_HaagMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=plpc_MckennaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=plpc_RobertRuhlmanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=plpc_RuhlmanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=plpc_RyanRuhlmanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=plpc_TrustMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Related Party Transactions - Additional Information (Detail) (USD $)	12 Months Ended			0 Months Ended	1 Months Ended		0 Months Ended
	Dec. 31, 2014 Lease Property	Dec. 31, 2013	Dec. 31, 2012	Aug. 14, 2014	Aug. 31, 2012	Dec. 31, 2012	May 09, 2013	Mar. 20, 2014	Nov. 12, 2013	May 08, 2013
Related Party Transaction [Line Items]
Purchase of common shares	40,145	89,807	50,334
Compensation payment received	$ 153,273
Ryan Ruhlman employee years of service	10 years
Compensation attributable to stock option	39,100
Service expense	0	0	700,000
Related party transactions number of property leased	2
Related party transaction lease expenses	300,000	300,000	300,000
Related party transactions number of property rented	2
Rent Expenses	200,000plpc_RelatedPartyTransactionRentExpense	300,000plpc_RelatedPartyTransactionRentExpense	300,000plpc_RelatedPartyTransactionRentExpense
Labor expense	$ 500,000	$ 300,000	$ 700,000
Ownership percentage owned by related party	50.00%plpc_RelatedPartyOwnershipPercentage
Trust [Member]
Related Party Transaction [Line Items]
Purchase of common shares				34,106	30,410
Common shares price per share				$ 54.83	$ 54.92
Number of trading days to be considered for average price of stock repurchased					30 days
Mckenna [Member]
Related Party Transaction [Line Items]
Purchase of common shares					4,100
Common shares price per share					$ 55.91
Number of trading days to be considered for average price of stock repurchased					30 days
Haag [Member]
Related Party Transaction [Line Items]
Purchase of common shares						7,408
Common shares price per share			$ 54.71			$ 54.71
Number of trading days to be considered for average price of stock repurchased						30 days
Ruhlman [Member]
Related Party Transaction [Line Items]
Purchase of common shares							9,757
Common shares price per share							$ 76.87
Robert G Ruhlman [Member]
Related Party Transaction [Line Items]
Purchase of common shares								2,098	25,000
Common shares price per share								$ 62.99	$ 78.91
Number of trading days to be considered for average price of stock repurchased								30 days	30 days
Dennis F Mckenna [Member]
Related Party Transaction [Line Items]
Purchase of common shares									2,750
Common shares price per share									$ 78.91
Number of trading days to be considered for average price of stock repurchased									30 days
J Cecil Curlee [Member]
Related Party Transaction [Line Items]
Purchase of common shares									2,500
Common shares price per share									$ 78.91
Number of trading days to be considered for average price of stock repurchased									30 days
Caroline S Vaccariello [Member]
Related Party Transaction [Line Items]
Purchase of common shares									1,750
Common shares price per share									$ 78.91
Number of trading days to be considered for average price of stock repurchased									30 days
Ryan Ruhlman [Member]
Related Party Transaction [Line Items]
Purchase of common shares									3,200	2,500
Common shares price per share									$ 78.91	$ 76.98
Number of trading days to be considered for average price of stock repurchased									30 days	30 days
David C Sunkle [Member]
Related Party Transaction [Line Items]
Purchase of common shares									1,000	3,000
Common shares price per share									$ 78.91	$ 76.98
Number of trading days to be considered for average price of stock repurchased									30 days	30 days