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Segment Information - Results of Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Jun. 30, 2017
Segment Reporting Information [Line Items]          
Gross revenues $ 247,902 $ 252,259 $ 802,318 $ 914,513  
Revenues 245,645 251,237 798,466 905,673  
Gross profit 14,891 (2,614) 70,485 57,876  
Operating income (5,862) (21,210) 6,633 1,328  
Segment assets 539,239   539,239   $ 586,030
Electrical Infrastructure [Member]          
Segment Reporting Information [Line Items]          
Gross revenues 58,378 82,032 203,201 273,215  
Revenues 58,378 82,032 203,201 273,215  
Gross profit 1,759 (13,371) 15,567 (896)  
Operating income (2,422) (16,306) 2,234 (13,085)  
Segment assets 180,837   180,837   183,351
Oil Gas & Chemical [Member]          
Segment Reporting Information [Line Items]          
Gross revenues 68,689 69,295 242,946 164,036  
Revenues 68,390 68,888 242,402 157,144  
Gross profit 4,744 4,333 27,550 6,765  
Operating income (648) (2,199) 8,684 (7,054)  
Segment assets 115,112   115,112   129,177
Storage Solutions [Member]          
Segment Reporting Information [Line Items]          
Gross revenues 78,859 74,431 221,664 403,008  
Revenues 76,901 74,052 218,357 402,331  
Gross profit 4,166 5,456 17,004 48,980  
Operating income (4,025) (1,552) (6,709) 23,463  
Segment assets 142,610   142,610   166,742
Industrial [Member]          
Segment Reporting Information [Line Items]          
Gross revenues 41,976 26,501 134,507 74,254  
Revenues 41,976 26,265 134,506 72,983  
Gross profit 4,222 968 10,364 3,027  
Operating income 1,233 (1,153) 2,424 (1,996)  
Segment assets 43,906   43,906   53,754
Other Segments [Member]          
Segment Reporting Information [Line Items]          
Segment assets 56,774   56,774   $ 53,006
Intersegment Eliminations [Member]          
Segment Reporting Information [Line Items]          
Gross revenues 2,257 1,022 3,852 8,840  
Intersegment Eliminations [Member] | Oil Gas & Chemical [Member]          
Segment Reporting Information [Line Items]          
Gross revenues 299 407 544 6,892  
Intersegment Eliminations [Member] | Storage Solutions [Member]          
Segment Reporting Information [Line Items]          
Gross revenues 1,958 379 3,307 677  
Intersegment Eliminations [Member] | Industrial [Member]          
Segment Reporting Information [Line Items]          
Gross revenues $ 0 $ 236 $ 1 $ 1,271