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v3.20.2

Operating Segments - Schedule of Segment Reporting Information (Details) (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Segment Reporting [Abstract] |  |  |  |
Net of financed amount | $ 751 | $ 6 | $ 883 | $ 29

X
- Definition Future cash outflow to pay for equipment purchases subject to financing. + References No definition available. + Details
Name: | PESI_CapitalExpenditureIncurredForEquipmentButNotYetPaid
Namespace Prefix: | PESI_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration