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Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Jun. 30, 2020
Segment Reporting Information [Line Items]          
Gross revenues $ 169,204 $ 320,932 $ 354,199 $ 660,112  
Revenue 167,468 318,677 350,239 656,774  
Gross profit (loss) 15,313 30,001 29,663 62,466  
Selling, general and administrative expenses 16,724 23,165 34,852 46,856  
Restructuring costs 5,045 38,515 4,725 38,515  
Operating income (6,456) (31,679) (9,914) (22,905)  
Segment assets 479,910   479,910   $ 517,310
Utility and Power Infrastructure [Member]          
Segment Reporting Information [Line Items]          
Gross revenues 52,023 49,155 112,694 96,882  
Revenue 52,023 49,155 112,694 96,882  
Gross profit (loss) 5,597 (1,226) 12,510 (1,394)  
Selling, general and administrative expenses 2,576 2,778 4,798 5,410  
Restructuring costs 812 24,900 823 24,900  
Operating income 2,209 (28,904) 6,889 (31,704)  
Segment assets 80,664   80,664   67,398
Process and Industrial Facilities          
Segment Reporting Information [Line Items]          
Gross revenues 51,747 143,769 98,475 299,221  
Revenue 51,262 142,883 97,193 297,760  
Gross profit (loss) 7,864 13,838 11,523 27,428  
Selling, general and administrative expenses 3,387 7,385 7,437 14,323  
Restructuring costs 3,364 13,615 2,864 13,615  
Operating income 1,113 (7,162) 1,222 (510)  
Segment assets 106,053   106,053   138,734
Storage and Terminal Solutions          
Segment Reporting Information [Line Items]          
Gross revenues 65,434 128,008 143,030 264,009  
Revenue 64,183 126,639 140,352 262,132  
Gross profit (loss) 1,852 18,026 5,630 37,768  
Selling, general and administrative expenses 3,919 6,791 9,062 13,777  
Restructuring costs 641 0 654 0  
Operating income (2,708) 11,235 (4,086) 23,991  
Segment assets 164,735   164,735   187,167
Corporate [Member]          
Segment Reporting Information [Line Items]          
Gross profit (loss) 0 (637) 0 (1,336)  
Selling, general and administrative expenses 6,842 6,211 13,555 13,346  
Restructuring costs 228 0 384 0  
Operating income (7,070) (6,848) (13,939) (14,682)  
Segment assets 128,458   128,458   $ 124,011
Intersegment Eliminations [Member]          
Segment Reporting Information [Line Items]          
Gross revenues 1,736 2,255 3,960 3,338  
Intersegment Eliminations [Member] | Process and Industrial Facilities          
Segment Reporting Information [Line Items]          
Gross revenues 485 886 1,282 1,461  
Intersegment Eliminations [Member] | Storage and Terminal Solutions          
Segment Reporting Information [Line Items]          
Gross revenues $ 1,251 $ 1,369 $ 2,678 $ 1,877