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General (Details)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 01, 2015
USD ($)
Mar. 31, 2014
USD ($)
Jul. 31, 2015
USD ($)
Feb. 28, 2015
Dec. 31, 2014
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Dec. 31, 2014
plant
Feb. 28, 2014
Dec. 31, 2013
General [Line Items]                          
Proceeds from sale of interests in Bayou Coating, L.L.C.                 $ 0 $ 9,065      
Equity in earnings of affiliated companies           $ 0 $ 0   0 677      
Proceeds from equity method investment                 0 684      
Loss on sale of interests in Bayou Coating, L.L.C.                 0 472      
Payments to purchase noncontrolling interest                 $ 0 $ 617      
Restructuring Plan 2014 [Member]                          
General [Line Items]                          
Number of plant closures | plant                     2    
Restructuring Plan 2014 [Member] | Minimum [Member]                          
General [Line Items]                          
Period of capital investments in the remaining coating facilities                 2 years        
Restructuring Plan 2014 [Member] | Maximum [Member]                          
General [Line Items]                          
Period of capital investments in the remaining coating facilities                 3 years        
CRTS [Member] | Subsequent Event [Member]                          
General [Line Items]                          
Contingent consideration payment     $ 700                    
Proceeds from settlement of escrow claims     1,000                    
CRTS [Member] | Subsequent Event [Member] | Operating Expense [Member]                          
General [Line Items]                          
Proceeds from settlement of escrow claims     200                    
CRTS [Member] | Subsequent Event [Member] | Other Income (Expense) [Member]                          
General [Line Items]                          
Proceeds from settlement of escrow claims     $ 800                    
Schultz Mechanical Contractors, Inc. [Member]                          
General [Line Items]                          
Total consideration recorded $ 7,878                        
Cash payments to acquire business 6,900                        
Purchase price 7,100                        
Working capital adjustment 200                        
Adjustment to account for deferred consideration $ 1,000                        
Ka-te [Member]                          
General [Line Items]                          
Period of trademark license         5 years                
Video Injection - Instituform SAS [Member]                          
General [Line Items]                          
Period of trademark license       5 years                  
Bayou Coating [Member]                          
General [Line Items]                          
Percent of book value   49.00%           49.00%         49.00%
Percent interest by noncontrolling owners   51.00%           51.00%          
Proceeds from sale of interests in Bayou Coating, L.L.C.   $ 9,100                      
Equity in earnings of affiliated companies               $ 1,200          
Proceeds from equity method investment               $ 700          
Delta Double Jointing [Member]                          
General [Line Items]                          
Percent interest by noncontrolling owners                       41.00%  
Percent ownership interest by parent                       59.00%  
Payments to purchase noncontrolling interest   $ 600                      
Insituform Linings Ltd. [Member] | Ka-te [Member]                          
General [Line Items]                          
Term of exclusive tube supply agreement         5 years                
Insituform Linings Ltd. [Member] | Video Injection - Instituform SAS [Member]                          
General [Line Items]                          
Term of exclusive tube supply agreement       5 years