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Goodwill and Other Intangible Assets - Goodwill (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Goodwill [Roll Forward]    
Goodwill, Gross $ 68,392 $ 64,483
Goodwill, Impaired, Accumulated Impairment Loss (39,595) (39,595)
Goodwill 28,797 24,888
Goodwill, Period Increase (Decrease) 2,882 3,909
Goodwill, Gross 71,274 68,392
Goodwill, Impaired, Accumulated Impairment Loss (39,595) (39,595)
Goodwill 31,679 28,797
Discounted Cash Flow
   
Goodwill [Line Items]    
Percentage of Valuation Method Used in Goodwill Assessment 50.00% 50.00%
Guideline Company Approach
   
Goodwill [Line Items]    
Percentage of Valuation Method Used in Goodwill Assessment 40.00% 40.00%
Guideline Transaction Approach
   
Goodwill [Line Items]    
Percentage of Valuation Method Used in Goodwill Assessment 10.00% 10.00%
Energy Operating Segment
   
Goodwill [Roll Forward]    
Goodwill, Gross 24,954 21,893
Goodwill, Impaired, Accumulated Impairment Loss (14,506) (14,506)
Goodwill 10,448 7,387
Goodwill, Period Increase (Decrease) 2,882 3,061
Goodwill, Gross 27,836 24,954
Goodwill, Impaired, Accumulated Impairment Loss (14,506) (14,506)
Goodwill 13,330 10,448
Environmental Operating Segment
   
Goodwill [Roll Forward]    
Goodwill, Gross 36,214 35,366
Goodwill, Impaired, Accumulated Impairment Loss (17,865) (17,865)
Goodwill 18,349 17,501
Goodwill, Period Increase (Decrease) 0 848
Goodwill, Gross 36,214 36,214
Goodwill, Impaired, Accumulated Impairment Loss (17,865) (17,865)
Goodwill 18,349 18,349
Infrastructure Operating Segment
   
Goodwill [Roll Forward]    
Goodwill, Gross 7,224 7,224
Goodwill, Impaired, Accumulated Impairment Loss (7,224) (7,224)
Goodwill 0 0
Goodwill, Period Increase (Decrease) 0 0
Goodwill, Gross 7,224 7,224
Goodwill, Impaired, Accumulated Impairment Loss (7,224) (7,224)
Goodwill $ 0 $ 0