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DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION (Details)	12 Months Ended
	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