Goodwill Schedule of Goodwill Allocated to Reporting Segments (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Beginning of the Period [Roll Forward]
Goodwill before impairment	$ 1,273,848
Accumulated impairment losses	(572,832)
Goodwill, net	701,016
Adjustments of previous acquisition	3,958
Effect of change in exchange rates	7,736
End of the Period [Roll Forward]
Goodwill before impairment	1,295,832
Accumulated impairment losses	(583,122)
Goodwill, net	712,710
Energy Operating Segment [Member]
Beginning of the Period [Roll Forward]
Goodwill before impairment	859,454
Accumulated impairment losses	(249,502)
Goodwill, net	609,952
Adjustments of previous acquisition	3,958
Effect of change in exchange rates	6,672
End of the Period [Roll Forward]
Goodwill before impairment	874,566
Accumulated impairment losses	(253,984)
Goodwill, net	620,582
Water Operating Segment [Member]
Beginning of the Period [Roll Forward]
Goodwill before impairment	414,394
Accumulated impairment losses	(323,330)
Goodwill, net	91,064
Adjustments of previous acquisition	0
Effect of change in exchange rates	1,064
End of the Period [Roll Forward]
Goodwill before impairment	421,266
Accumulated impairment losses	(329,138)
Goodwill, net	$ 92,128