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Segment Information - Results of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Jun. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |  |
Gross revenues | $ 314,024 | $ 325,907 | $ 662,254 | $ 646,396 |
Consolidated revenues | 312,655 | 323,529 | 654,436 | 642,860 |
Gross profit | 28,212 | 30,005 | 60,490 | 64,589 |
Operating income | 8,237 | 4,935 | 22,538 | 20,036 |
Segment assets | 635,790 |  | 635,790 |  | $ 564,967
Goodwill | 113,019 |  | 113,019 |  | 78,293
Electrical Infrastructure [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gross revenues | 103,158 | 91,398 | 191,183 | 157,023 |
Consolidated revenues | 103,158 | 91,398 | 191,183 | 157,023 |
Gross profit | 7,225 | 4,021 | 12,475 | 8,729 |
Operating income | 2,164 | (723) | 3,221 | 477 |
Segment assets | 159,388 |  | 159,388 |  | 135,298
Goodwill | 41,943 |  | 41,943 |  | 42,170
Oil Gas & Chemical [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gross revenues | 56,913 | 63,472 | 94,741 | 132,431 |
Consolidated revenues | 55,714 | 61,540 | 88,256 | 129,851 |
Gross profit | 2,431 | 5,971 | 2,432 | 11,654 |
Operating income | (1,950) | (3,029) | (4,855) | (1,613) |
Segment assets | 148,095 |  | 148,095 |  | 91,350
Goodwill | 42,731 |  | 42,731 |  | 14,008
Storage Solutions [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gross revenues | 128,927 | 122,647 | 328,577 | 267,217 |
Consolidated revenues | 128,757 | 122,169 | 328,279 | 266,405 |
Gross profit | 17,071 | 14,426 | 43,524 | 34,658 |
Operating income | 8,242 | 6,374 | 25,015 | 17,923 |
Segment assets | 194,397 |  | 194,397 |  | 201,875
Goodwill | 16,648 |  | 16,648 |  | 16,681
Industrial [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gross revenues | 25,026 | 48,390 | 47,753 | 89,725 |
Consolidated revenues | 25,026 | 48,422 | 46,718 | 89,581 |
Gross profit | 1,485 | 5,587 | 2,059 | 9,548 |
Operating income | (219) | 2,313 | (843) | 3,249 |
Segment assets | 78,348 |  | 78,348 |  | 67,569
Goodwill | 11,697 |  | 11,697 |  | 5,434
Other Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment assets | 55,562 |  | 55,562 |  | $ 68,875
Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gross revenues | 1,369 | 2,378 | 7,818 | 3,536 |
Intersegment Eliminations [Member] | Oil Gas & Chemical [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gross revenues | 1,199 | 1,932 | 6,485 | 2,580 |
Intersegment Eliminations [Member] | Storage Solutions [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gross revenues | 170 | 478 | 298 | 812 |
Intersegment Eliminations [Member] | Industrial [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gross revenues | $ 0 | $ (32) | $ 1,035 | $ 144 |

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