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Related Party Transactions (Details) (USD $) | 6 Months Ended
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Jun. 30, 2013
Related Party Transaction [Line Items] |
Number of shares authorized for purchase (in shares) | 250,000
Common stock per share (in dollars per share) | $ 1.35
Mr. Christopher Leichtweis [Member] |
Related Party Transaction [Line Items] |
Number of shares authorized for purchase (in shares) | 250,000
Common stock per share (in dollars per share) | $ 1.35
Period after separation consider election of option | 30 days
Number of shares after separation consider election of option (in shares) | 62,500
Compensation hourly rate | $ 135

X
- Definition Element refers the Compensation hourly rate as per the agreement. + References No definition available. + Details
Name: | pesi_CompensationHourlyRate
Namespace Prefix: | pesi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Element refers the number of shares after separation date can be purchase. + References No definition available. + Details
Name: | pesi_NumberOfSharesAfterSeparationConsiderElectionOfOption
Namespace Prefix: | pesi_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Element refers the period after separation date, option can exercise to purchase shares. + References No definition available. + Details
Name: | pesi_PeriodAfterSeparationConsiderElectionOfOption
Namespace Prefix: | pesi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section H + Details
Name: | us-gaap_SaleOfStockPricePerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant