Goodwill Schedule of Goodwill Allocated to Reporting Segments (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Goodwill [Line Items]
Goodwill beginning balance	$ 636,910	$ 1,209,376
Goodwill acquired	46,101	10,251
Goodwill impairment	0	(584,847)	0
Other	4,767	(7,720)
Effect of change in exchange rates	13,238	9,850
Goodwill before impairment	1,273,848
Accumulated impairment loss	(572,832)
Goodwill ending balance	701,016	636,910	1,209,376
Energy Operating Segment [Member]
Goodwill [Line Items]
Goodwill beginning balance	553,866	792,873
Goodwill acquired	46,101	10,251
Goodwill impairment		(254,735)
Other	3,994	(981)
Effect of change in exchange rates	5,991	6,458
Goodwill before impairment	859,454
Accumulated impairment loss	(249,502)
Goodwill ending balance	609,952	553,866
Water Operating Segment [Member]
Goodwill [Line Items]
Goodwill beginning balance	83,044	416,503
Goodwill acquired	0	0
Goodwill impairment		(330,112)
Other	773	(6,739)
Effect of change in exchange rates	7,247	3,392
Goodwill before impairment	414,394
Accumulated impairment loss	(323,330)
Goodwill ending balance	$ 91,064	$ 83,044