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Goodwill and Other Intangible Assets (Schedule of Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Goodwill [Roll Forward]
Balance as of December 31, 2014	$ 9,606us-gaap_Goodwill
Additions due to acquisitions	1,177us-gaap_GoodwillAcquiredDuringPeriod
Adjustments	(159)us-gaap_GoodwillPurchaseAccountingAdjustments
Balance as of March 31, 2015	10,624us-gaap_Goodwill
T & D Solutions Segment [Member]
Goodwill [Roll Forward]
Balance as of December 31, 2014	6,029us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ppsi_TAndDSolutionsSegmentMember
Additions due to acquisitions	1,177us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = ppsi_TAndDSolutionsSegmentMember
Balance as of March 31, 2015	7,206us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ppsi_TAndDSolutionsSegmentMember
Critical Power Solutions Segment [Member]
Goodwill [Roll Forward]
Balance as of December 31, 2014	3,577us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ppsi_CriticalPowerSolutionsSegmentMember
Adjustments	(159)us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = ppsi_CriticalPowerSolutionsSegmentMember
Balance as of March 31, 2015	$ 3,418us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ppsi_CriticalPowerSolutionsSegmentMember

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

+ Details

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X

- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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X

- Definition

Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 25

-Paragraph 16

-URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e961-128460

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