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Accrued Closure Costs and ARO - Schedule of Asset Retirement Obligations (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Asset Retirement Obligation Disclosure [Abstract] |  |
Balance at beginning | $ 3,539 | $ 3,730
Amortization of closure and post-closure asset | (191) | (191)
Balance at end | $ 3,348 | $ 3,539

X
- Definition Represents the amortization for the period in the amount of closure and post-closure asset of disposal facilities. + References No definition available. + Details
Name: | PESI_AmortizationOfClosureAndPostClosureAsset
Namespace Prefix: | PESI_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the carrying amount of closure and post closure assets of disposal facilities. + References No definition available. + Details
Name: | PESI_ClosureAndPostClosureAssets
Namespace Prefix: | PESI_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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