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Debt (Schedule of Long-Term Debt) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Total debt	$ 7,255ppsi_LongTermDebtAndCapitalLeaseObligations1	$ 12,022ppsi_LongTermDebtAndCapitalLeaseObligations1
Less current portion	(1,277)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent	(2,483)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Total long-term debt	5,978us-gaap_LongTermDebtAndCapitalLeaseObligations	9,539us-gaap_LongTermDebtAndCapitalLeaseObligations
Term Credit Facilities [Member]
Debt Instrument [Line Items]
Total debt	6,654ppsi_LongTermDebtAndCapitalLeaseObligations1 / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember	11,165ppsi_LongTermDebtAndCapitalLeaseObligations1 / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember
Other Notes Payable [Member]
Debt Instrument [Line Items]
Total debt	70ppsi_LongTermDebtAndCapitalLeaseObligations1 / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember	260ppsi_LongTermDebtAndCapitalLeaseObligations1 / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Total debt	9ppsi_LongTermDebtAndCapitalLeaseObligations1 / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember	10ppsi_LongTermDebtAndCapitalLeaseObligations1 / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember
Nexus Promissory Note [Member]
Debt Instrument [Line Items]
Total debt	$ 522ppsi_LongTermDebtAndCapitalLeaseObligations1 / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember	$ 587ppsi_LongTermDebtAndCapitalLeaseObligations1 / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember

X

- Definition

Carrying value as of balance sheet of total debt and capital lease obligations.

+ References

No definition available.

+ Details

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Namespace Prefix:	ppsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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

X

- Definition

Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



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

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section H

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of long-term debt and capital leases due within one year or the normal operating cycle, if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.20)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LoansPayableMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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