Restructuring Restructuring Expected Costs, Costs To-Date, Remaining Costs, and Costs During the Period (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Restructuring Cost and Reserve [Line Items]
Total expected costs at period end			$ 81,119
Costs recognized in prior periods					68,082
Costs recognized during the period ended	(5,054)	1,096	3,455	3,003
Remaining costs to be recognized at period end			9,582
Employee severance costs [Member]
Restructuring Cost and Reserve [Line Items]
Total expected costs at period end			51,395
Costs recognized in prior periods					42,530
Costs recognized during the period ended			3,668
Remaining costs to be recognized at period end			5,197
Asset impairments [Member]
Restructuring Cost and Reserve [Line Items]
Total expected costs at period end			21,356
Costs recognized in prior periods					25,144
Costs recognized during the period ended			(4,841)
Remaining costs to be recognized at period end			1,053
Other restructuring costs [Member]
Restructuring Cost and Reserve [Line Items]
Total expected costs at period end			8,368
Costs recognized in prior periods					408
Costs recognized during the period ended			4,628
Remaining costs to be recognized at period end			3,332
Energy [Member]
Restructuring Cost and Reserve [Line Items]
Total expected costs at period end			59,312
Costs recognized in prior periods					51,873
Costs recognized during the period ended			3,536
Remaining costs to be recognized at period end			3,903
Water [Member]
Restructuring Cost and Reserve [Line Items]
Total expected costs at period end			16,210
Costs recognized in prior periods					15,321
Costs recognized during the period ended			(871)
Remaining costs to be recognized at period end			1,760
Corporate Unallocated [Member]
Restructuring Cost and Reserve [Line Items]
Total expected costs at period end			5,597
Costs recognized in prior periods					888
Costs recognized during the period ended			790
Remaining costs to be recognized at period end			$ 3,919