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Basis of Presentation (Narrative) (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2016 Segment	Jun. 30, 2015 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of reportable segments | Segment		2
Prior period reclassification adjustment | $	$ 141		$ 309
Percentage of sales	0.50%		0.60%

X

- Definition

The prior period adjustment shown as a percentage of sales.

+ References

No definition available.

+ Details

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Namespace Prefix:	ppsi_
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Balance Type:	na
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X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

The amount of a reclassification adjustment made to prior period financial statement amounts.

+ References

No definition available.

+ Details

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