Note 4 - Goodwill and Intangible Assets (Details) - Reconciliation Goodwill (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Goodwill [Roll Forward]
Goodwill	$ 334,180
Foreign currency translation	(459)
Goodwill	333,737
Energy And Mining [Member]
Goodwill [Roll Forward]
Goodwill	138,610
Foreign currency translation	(469)
Goodwill	138,141
Water and Wastewater [Member]
Goodwill [Roll Forward]
Goodwill	130,078
Foreign currency translation	13
Goodwill	130,107
Commercial And Structural [Member]
Goodwill [Roll Forward]
Goodwill	65,492
Foreign currency translation	(3)
Goodwill	$ 65,489