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Intangible Assets Including Goodwill - Carrying Value of Goodwill By Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2017
May 31, 2017
Dec. 12, 2016
Goodwill [Line Items]      
Goodwill $ 113,501    
Goodwill [Roll Forward]      
Net balance at June 30, 2015 113,501    
Translation adjustment 359    
Net balance at September 30, 2017 113,860    
Electrical Infrastructure [Member]      
Goodwill [Line Items]      
Goodwill 42,152    
Goodwill [Roll Forward]      
Net balance at June 30, 2015 42,152    
Translation adjustment 234    
Net balance at September 30, 2017 42,386    
Oil Gas & Chemical [Member]      
Goodwill [Line Items]      
Goodwill 33,604    
Goodwill [Roll Forward]      
Net balance at June 30, 2015 33,604    
Translation adjustment 0    
Net balance at September 30, 2017 33,604    
Storage Solutions [Member]      
Goodwill [Line Items]      
Goodwill 16,764    
Goodwill [Roll Forward]      
Net balance at June 30, 2015 16,764    
Translation adjustment 81    
Net balance at September 30, 2017 16,845    
Industrial [Member]      
Goodwill [Line Items]      
Goodwill 20,981    
Goodwill [Roll Forward]      
Net balance at June 30, 2015 20,981    
Translation adjustment 44    
Net balance at September 30, 2017 $ 21,025    
Reporting Unit [Member]      
Goodwill [Line Items]      
Goodwill   $ 8,000  
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount   9.00%  
Houston Interests, LLC [Member]      
Goodwill [Line Items]      
Goodwill     $ 35,146