Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 9, 10, 11, 12

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14435-108349

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 9

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14557-108349

Name:	us-gaap_LossContingencyEstimateOfPossibleLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Commitments and Contingencies (Details)		6 Months Ended		6 Months Ended
Commitments and Contingencies (Details)	Feb. 13, 2013 USD ($)	Jan. 31, 2013 Ecology and Environment do Brasil LTDA [Member] USD ($) Employee	Feb. 04, 2011 Ecology and Environment do Brasil LTDA [Member] BRL	Jan. 31, 2013 City of Denver [Member] USD ($)	Jan. 31, 2013 Walsh Environmental Scientists and Engineers [Member] USD ($)
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss		$ 300,000	520,000
Number of employees individually served with Notices of Infraction		4
Penalty				200,000	100,000
Supplemental Environmental Project	$ 100,000