Note 4 - Goodwill and Intangible Assets (Details) - Reconciliation Goodwill (USD $)	9 Months Ended
	Sep. 30, 2013
Goodwill [Roll Forward]
Goodwill	$ 272,294,000
Additions to goodwill through acquisitions	62,900,000
Foreign currency translation	(800,000)
Goodwill	334,416,000
Energy And Mining [Member]
Goodwill [Roll Forward]
Goodwill	76,700,000	[1],[2]
Additions to goodwill through acquisitions	62,700,000	[1],[2]
Foreign currency translation	(400,000)	[1],[2]
Goodwill	139,000,000	[1],[2],[3]
North American Water And Wastewater [Member]
Goodwill [Roll Forward]
Goodwill	101,900,000
Additions to goodwill through acquisitions	0
Foreign currency translation	900,000
Goodwill	102,800,000	[3]
International Water And Wastewater [Member]
Goodwill [Roll Forward]
Goodwill	28,100,000
Additions to goodwill through acquisitions	0
Foreign currency translation	(1,000,000)
Goodwill	27,100,000	[3]
Commercial And Structural [Member]
Goodwill [Roll Forward]
Goodwill	65,600,000	[4]
Additions to goodwill through acquisitions	200,000	[4]
Foreign currency translation	(300,000)	[4]
Goodwill	$ 65,500,000	[3],[4]

[1] During the second quarter of 2013, the Company approved a plan of liquidation with respect to BWW and, in connection therewith, recorded a write-down of the $1.4 million of goodwill associated with BWW, which operation now is reported as discontinued. Consequently, the goodwill associated with BWW is no longer included in this table. Additionally, all prior year balances have been retrospectively adjusted. For further information, see Note 9 contained within this report.

[2] During 2013, the Company recorded an increase of goodwill of $62.7 million related to the Brinderson acquisition.

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

[4] During 2013, the Company recorded an increase of goodwill of $0.2 million related to the Fyfe Asia acquisition.