Note 4 - Goodwill and Intangible Assets (Detail) - Goodwill (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Goodwill	$ 272,728	[1]	$ 273,661
Energy And Mining [Member]
Goodwill	77,900	[1]	78,100
North American Water and Wastewater [Member]
Goodwill	101,800	[1]	101,900
International Water and Wastewater [Member]
Goodwill	27,300	[1]	28,100
Commercial And Structural [Member]
Goodwill	$ 65,700	[1]	$ 65,600

[1] The Company does not have any accumulated impairment charges.