Acquisitions (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Business Acquisition [Line Items]
Total Cash Paid (net of cash acquired)	$ 21,467
Atlas Environmental Consulting, Inc. and Atlas Oilfield Construction Company, LLC
Business Acquisition [Line Items]
Closing Date	Feb. 19, 2013
Total Cash Paid (net of cash acquired)	12,979
Petroleum Water Solutions, LLC
Business Acquisition [Line Items]
Closing Date	Feb. 22, 2013
Total Cash Paid (net of cash acquired)	3,288
Karnes Water Management LLC
Business Acquisition [Line Items]
Closing Date	Dec. 31, 2013
Total Cash Paid (net of cash acquired)	$ 5,200