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Commitments and Contingencies (Details Narrative) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2003 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Interest income, other |  | $ 82 | $ 34 | $ 212 | $ 105 |
Letters of credit outstanding, amount |  | 2,660 |  | 2,660 |  |
Bond outstanding |  | 11,081 |  | 11,081 |  |
American International Group, Inc [Member] |  |  |  |  |  |
Period of finite risk insurance policy | 25 years |  |  |  |  |
Maximum allowable coverage of insurance policy |  | 39,000 |  | 39,000 |  |
Financial assurance coverage amount under insurance policy |  | 29,911 |  | 29,911 |  |
Sinking fund related to insurance policy |  | 15,888 |  | 15,888 |  | $ 15,676
Interest earned on sinking fund |  | 1,417 |  | 1,417 |  | $ 1,205
Interest income, other |  | $ 82 | $ 35 | $ 212 | $ 96 |
Insurers obligation to entity on termination of contract |  | 100.00% |  | 100.00% |  |

X
- Definition The total amount of the bonds outstanding as of the reporting date. + References No definition available. + Details
Name: | PESI_BondOutstanding
Namespace Prefix: | PESI_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the financial assurance coverage amount under insurance policy. + References No definition available. + Details
Name: | PESI_FinancialAssuranceCoverageAmountUnderInsurancePolicy
Namespace Prefix: | PESI_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Insurer's obligation to entity on termination of contract in terms of percentage of sinking fund. + References No definition available. + Details
Name: | PESI_InsurersObligationToEntityOnTerminationOfContract
Namespace Prefix: | PESI_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the interest earned on sinking fund. + References No definition available. + Details
Name: | PESI_InterestEarnedOnSinkingFund
Namespace Prefix: | PESI_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Maximum allowable coverage of insurance policy against annual inflation and other performance and surety bond requirements. + References No definition available. + Details
Name: | PESI_MaximumAllowableCoverageOfInsurancePolicy
Namespace Prefix: | PESI_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the period of finite risk insurance policy. + References No definition available. + Details
Name: | PESI_PeriodOfFiniteRiskInsurancePolicy
Namespace Prefix: | PESI_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the sinking fund related to the insurance policy. + References No definition available. + Details
Name: | PESI_SinkingFundRelatedToInsurancePolicy
Namespace Prefix: | PESI_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of interest income earned from interest bearing assets classified as other. + References No definition available. + Details
Name: | us-gaap_InterestIncomeOther
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | srt_CounterpartyNameAxis=PESI_AmericanInternationalGroupIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |