XML 73 R38.htm IDEA: XBRL DOCUMENT
v2.4.0.8

ACCRUED CLOSURE COSTS (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2012
ACCRUED CLOSURE COSTS [Abstract] |
Changes to reported closure liabilities | Changes to reported closure liabilities for the years ended December 31, 2011 and 2012, were as follows:
Amounts in thousands |  |  |
Balance as of December 31, 2010 |  | $ | 12,362 |
Accretion expense |  |  | 79 |
Payments |  |  | ― |
Adjustments |  |  | (504 | )
Balance as of December 31, 2011 |  |  | 11,937 |
Accretion expense |  |  | 185 |
Payments |  |  | (773 | )
Adjustments |  |  | ― |
Balance as of December 31, 2012 |  | $ | 11,349 |

X
- Details
Name: | pesi_AccruedClosureCostsAbstract
Namespace Prefix: | pesi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of an entity's restructuring reserve that occurred during the period associated with the exit from or disposal of business activities or restructurings for each major type of cost. This element may also include a description of any reversal and other adjustment made during the period to the amount of an accrued liability for restructuring activities. This element may be used to encapsulate the roll forward presentations of an entity's restructuring reserve by type of cost and in total, and explanation of changes that occurred in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=6394695&loc=d3e140904-122747 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 146 -Paragraph 20 -Subparagraph b(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
Name: | us-gaap_ScheduleOfRestructuringReserveByTypeOfCostTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration