Segment Information Major Customers (Details)	9 Months Ended			3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013 Revenue [Member] Threshold for Reporting Customer Concentration [Member]	Sep. 30, 2012 Revenue [Member] Customer A [Member]	Sep. 30, 2012 Revenue [Member] Customer A [Member] Energy Operating Segment [Member]	Sep. 30, 2012 Revenue [Member] Customer A [Member] Energy Operating Segment [Member]
Revenue, Major Customer [Line Items]
Segment Reporting, Disclosure of Major Customers	For the three and nine months ended September 30, 2013, no single customer represented more than 10% of the total Company, the Energy operating segment, or the Water operating segment revenues. For the nine months ended September 30, 2012, one customer from the Energy operating segment accounted for 10% of the total Company revenues, while no customer represented more than 10% of the total Company revenues during the three months ended September 30, 2012. During the three and nine months ended September 30, 2012, one customer accounted for 11% and 13%, respectively, of the Energy operating segment revenues, and no single customer accounted for more than 10% of the Water operating segment revenues.
Concentration Risk, Percentage		10.00%	10.00%	11.00%	13.00%