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Summary of Significant Accounting Policies (Details Narrative) - USD ($) $ in Thousands	Sep. 30, 2018	Jan. 02, 2018	Dec. 31, 2017	Sep. 30, 2017
Accounting Policies [Abstract]
Increase in accumulated deficit		$ 317
Finite risk sinking fund	$ 15,888		$ 15,676	$ 15,642

X

- Definition

As of the balance sheet date, the total amount into the sinking fund, along with interest income earned, in connection for the company's closure policies.

+ References

No definition available.

+ Details

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Namespace Prefix:	PESI_
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Balance Type:	debit
Period Type:	instant

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- References

No definition available.

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- Definition

Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

+ References

No definition available.

+ Details

Name:	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption
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Data Type:	xbrli:monetaryItemType
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