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DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION (Details) | 12 Months Ended
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Dec. 31, 2012 Facility Segment
DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION [Abstract] |
Number of reportable segments | 2
Number of uniquely licensed and permitted treatment and storage facilities | 4
Business Acquisition [Line Items] |
Number of non-operational facilities | 2

X
- Definition Refers to number of non operational facilities. + References No definition available. + Details
Name: | pesi_NumberOfNonOperationalFacilities
Namespace Prefix: | pesi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of uniquely licensed and permitted treatment and storage facilities. + References No definition available. + Details
Name: | pesi_NumberOfUniquelyLicensedAndPermittedTreatmentAndStorageFacilities
Namespace Prefix: | pesi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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

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