Acquisitions (Details) (USD $) In Thousands, unless otherwise specified			12 Months Ended	6 Months Ended
Jun. 30, 2013	Dec. 31, 2012	Dec. 31, 2012 Mayo Marrs Casing Pulling, Inc.	Dec. 31, 2012 SPA Victoria, LP	Dec. 31, 2012 Surface Stac, Inc.	Dec. 31, 2012 Salt Water Disposal of North Dakota LLC	Jun. 30, 2013 Atlas Environmental Consulting, Inc. and Atlas Oilfield Construction Company, LLC	Jun. 30, 2013 Petroleum Water Solutions, LLC
Business Acquisition [Line Items]
Closing Date			Jan. 13, 2012	Mar. 16, 2012	May 15, 2012	Dec. 19, 2012	Feb. 19, 2013	Feb. 22, 2013
Total Cash Paid (net of cash acquired)	$ 16,463	$ 84,966	$ 6,644	$ 11,948	$ 23,184	$ 43,190	$ 13,175	$ 3,288

Amount of cash paid to acquire the entity.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 68

-Subparagraph f(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant