Note 12 - Subsequent Event (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Restructuring Cost and Reserve [Line Items]
Tangible Asset Impairment Charges	$ 11,870,000	$ 1,100,000
Impairment of Intangible Assets, Finite-lived	10,896,000	0	10,896,000	0
Restructuring Costs and Asset Impairment Charges	39,953,000		17,187,000	0
Restructuring Reserve, Settled without Cash	17,187,000
Restructuring and Related Cost, Expected Number of Positions Eliminated			170
Entity Number of Employees	6,000		6,000
Energy And Mining [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Costs and Asset Impairment Charges	22,200,000
Water and Wastewater [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Costs and Asset Impairment Charges	17,800,000
Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Payments for Restructuring			15,000,000
Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Payments for Restructuring			18,000,000
Cost of Sales [Member]
Restructuring Cost and Reserve [Line Items]
Tangible Asset Impairment Charges	11,834,000
Impairment of Intangible Assets, Finite-lived	0
Restructuring Costs and Asset Impairment Charges	14,940,000
Restructuring Reserve, Settled without Cash	3,106,000
Operating Expense [Member]
Restructuring Cost and Reserve [Line Items]
Tangible Asset Impairment Charges	36,000
Impairment of Intangible Assets, Finite-lived	0
Restructuring Costs and Asset Impairment Charges	14,117,000
Restructuring Reserve, Settled without Cash	14,081,000
Definite-lived Intangible Asset Impairment [Member]
Restructuring Cost and Reserve [Line Items]
Tangible Asset Impairment Charges	0
Impairment of Intangible Assets, Finite-lived	10,896,000
Restructuring Costs and Asset Impairment Charges	10,896,000
Restructuring Reserve, Settled without Cash	$ 0