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Other Long-Term Liabilties (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Apr. 20, 2016
Past Due Payroll Obligations [Member]
Debt Instrument [Line Items]
Reclassification of liability	$ 2,800
Subsequent Event [Member] | Internal Revenue Service (IRS) [Member]
Debt Instrument [Line Items]
Balance of liability under agreements		84.00%

X

- Definition

Percent of outstanding amount under installment agreements.

+ References

No definition available.

+ Details

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Namespace Prefix:	ppsi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Reclassifications of liabilities to long-term debt.

+ References

No definition available.

+ Details

Name:	ppsi_ReclassificationOfLiability
Namespace Prefix:	ppsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_UnsecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeTaxAuthorityAxis=us-gaap_InternalRevenueServiceIRSMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: