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Note 4 - Goodwill and Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill [Table Text Block]
 
Energy
and
Mining (1)(2)
 
North American
Water and
Wastewater
 
International
Water and
Wastewater
 
Commercial
and Structural (3)
 
Total
Beginning balance at January 1, 2013
$
76.7

 
$
101.9

 
$
28.1

 
$
65.6

 
$
272.3

Additions to goodwill through acquisitions
62.7

 
—

 
—

 
0.2

 
62.9

Foreign currency translation
(0.8
)
 
(0.3
)
 
0.4

 
(0.3
)
 
(1.0
)
Goodwill at December 31, 2013
$
138.6

 
$
101.6

 
$
28.5

 
$
65.5

 
$
334.2

__________________________
(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 11.
(2) 
During 2013, the Company recorded an increase of goodwill of $62.7 million related to the Brinderson acquisition.
(3) 
During 2013, the Company recorded an increase of goodwill of $0.2 million related to the Fyfe Asia acquisition.
Schedule of Finite-Lived Intangible Assets [Table Text Block]
Intangible assets at December 31, 2013 and 2012 were as follows (in thousands):
 
As of December 31, 2013 (1)(2)
 
As of December 31, 2012
 
Weighted Average Useful Lives (Years)
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
License agreements
6
 
$
3,917

 
$
(2,977
)
 
$
940

 
$
3,925

 
$
(2,821
)
 
$
1,104

Backlog
0
 
4,745

 
(4,745
)
 
—

 
4,756

 
(4,756
)
 
—

Leases
13
 
2,067

 
(477
)
 
1,590

 
2,067

 
(331
)
 
1,736

Trademarks
16
 
21,394

 
(4,167
)
 
17,227

 
21,290

 
(3,317
)
 
17,972

Non-competes
5
 
1,140

 
(753
)
 
387

 
710

 
(710
)
 
—

Customer relationships
14
 
182,703

 
(28,287
)
 
154,416

 
123,301

 
(18,912
)
 
104,389

Patents and acquired technology
17
 
57,419

 
(22,696
)
 
34,723

 
55,672

 
(21,244
)
 
34,428

 
 
 
$
273,385

 
$
(64,102
)
 
$
209,283

 
$
211,721

 
$
(52,091
)
 
$
159,629

__________________________
(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 $2.5 million of intangible assets associated with BWW, which operation now is reported as discontinued. Consequently, the intangible assets and accumulated amortization associated with BWW are no longer included in this table. Additionally, all prior year balances have been retrospectively adjusted. For further information, see Note 11.
(2) 
During the third quarter of 2013, the Company recorded $59.8 million in customer relationships to be amortized over a weighted average life of 15 years and $0.4 million in non-compete agreements to be amortized over a weighted average life of 5 years related to the acquisition of Brinderson, as discussion in Note 1.
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
Estimated amortization expense by year is as follows (in thousands):
2014
 
$
14,606

2015
 
14,606

2016
 
14,602

2017
 
14,565

2018
 
14,488