Note 4 - Goodwill and Intangible Assets (Detail) - Schedule of Goodwill (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012		Dec. 31, 2011		Dec. 31, 2010
Goodwill	$ 271,491	[1]	$ 249,888	[1]	$ 190,100
Energy And Mining [Member]
Goodwill	77,800		77,400
North American Water and Wastewater [Member]
Goodwill	101,800		101,800
European Water and Wastewater [Member]
Goodwill	21,400		21,800
Asia-Pacific Water and Wastewater [Member]
Goodwill	5,700		5,700
Commercial And Structural [Member]
Goodwill	$ 64,800		$ 43,200

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