Goodwill Schedule of Goodwill Allocated to Reporting Segments (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 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	(8,759)
End of the Period [Roll Forward]
Goodwill before impairment	1,258,968
Accumulated impairment losses	(562,753)
Goodwill, net	696,215
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	(7,551)
End of the Period [Roll Forward]
Goodwill before impairment	851,471
Accumulated impairment losses	(245,112)
Goodwill, net	606,359
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	(1,208)
End of the Period [Roll Forward]
Goodwill before impairment	407,497
Accumulated impairment losses	(317,641)
Goodwill, net	$ 89,856