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

Future cash outflow to pay for equipment purchases subject to financing.

No definition available.

Name:	PESI_CapitalExpenditureIncurredForEquipmentButNotYetPaid
Namespace Prefix:	PESI_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration