Note 4 - Goodwill and Acquired Intangible Assets (Detail) - Goodwill (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Goodwill (in Dollars)	$ 273,661	[1]	$ 249,888
Energy and Mining [Member]
Goodwill (in Dollars)	78,100	[1]	77,400
North American Sewer and Water Rehabilitation [Member]
Goodwill (in Dollars)	101,900	[1]	101,800
European Sewer and Water Rehabilitation [Member]
Goodwill (in Dollars)	22,300	[1]	21,800
Asia-Pacific Sewer and Water Rehabilitation [Member]
Goodwill (in Dollars)	5,800	[1]	5,700
Commercial and Structural [Member]
Goodwill (in Dollars)	$ 65,600	[1]	$ 43,200

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