Goodwill Schedule of Goodwill Allocated to Reporting Segments (Details) (USD $)	9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Goodwill [Line Items]
Goodwill before impairment	$ 1,242,159,000	$ 1,221,757,000
Accumulated impairment losses	(554,727,000)	(584,847,000)
Goodwill, net	687,432,000	636,910,000
Goodwill, Acquired During Period	46,881,000
Other	4,767,000
Effect of change in exchange rates	(1,126,000)
Energy Operating Segment [Member]
Goodwill [Line Items]
Goodwill before impairment	840,009,000	808,601,000
Accumulated impairment losses	(241,616,000)	(254,735,000)
Goodwill, net	598,393,000	553,866,000
Goodwill, Acquired During Period	46,881,000
Other	3,994,000
Effect of change in exchange rates	(6,348,000)
Water Operating Segment [Member]
Goodwill [Line Items]
Goodwill before impairment	402,150,000	413,156,000
Accumulated impairment losses	(313,111,000)	(330,112,000)
Goodwill, net	89,039,000	83,044,000
Goodwill, Acquired During Period	0
Other	773,000
Effect of change in exchange rates	$ 5,222,000