Acquisitions (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	1 Months Ended
	Sep. 30, 2014	Sep. 30, 2014 H2O,Inc.[Member] customer	Sep. 30, 2014 Lake Caroline [Member] customer	Aug. 31, 2014 Tri-State Grouting [Member}	May 31, 2014 North Maine Utilities [Member] customer	Mar. 31, 2014 Penn Township [Member] customer	Mar. 31, 2013 Total Envirmental Solutions, Inc. [Member] customer
Business Acquisition [Line Items]
Number of customers		1,100	1,040		7,200	800	4,200
Cash paid for acquisitions		$ 2,796	$ 1,377	$ 3,010	$ 22,000	$ 3,668	$ 10,350
Contingent consideration				$ 810
Contingent consitderation term	3 years