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Segment Information - Results of Operations (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  |  |  | 3 Months Ended |
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Sep. 30, 2014 | Sep. 30, 2013 | Jun. 30, 2014 | Sep. 30, 2014 Electrical Infrastructure [Member] | Sep. 30, 2013 Electrical Infrastructure [Member] | Jun. 30, 2014 Electrical Infrastructure [Member] | Sep. 30, 2014 Oil Gas & Chemical [Member] | Sep. 30, 2013 Oil Gas & Chemical [Member] | Jun. 30, 2014 Oil Gas & Chemical [Member] | Sep. 30, 2014 Storage Solutions [Member] | Sep. 30, 2013 Storage Solutions [Member] | Jun. 30, 2014 Storage Solutions [Member] | Sep. 30, 2014 Industrial [Member] | Sep. 30, 2013 Industrial [Member] | Jun. 30, 2014 Industrial [Member] | Sep. 30, 2014 Other Segments [Member] | Jun. 30, 2014 Other Segments [Member] | Sep. 30, 2014 Intersegment Eliminations [Member] | Sep. 30, 2013 Intersegment Eliminations [Member] | Sep. 30, 2014 Intersegment Eliminations [Member] Electrical Infrastructure [Member] | Sep. 30, 2013 Intersegment Eliminations [Member] Electrical Infrastructure [Member] | Sep. 30, 2014 Intersegment Eliminations [Member] Oil Gas & Chemical [Member] | Sep. 30, 2013 Intersegment Eliminations [Member] Oil Gas & Chemical [Member] | Sep. 30, 2014 Intersegment Eliminations [Member] Storage Solutions [Member] | Sep. 30, 2013 Intersegment Eliminations [Member] Storage Solutions [Member] | Sep. 30, 2014 Intersegment Eliminations [Member] Industrial [Member] | Sep. 30, 2013 Intersegment Eliminations [Member] Industrial [Member] | Dec. 21, 2013 Kvaerner NAC
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross revenues | $ 322,582 | $ 226,906 |  | $ 55,673 | $ 32,877 |  | $ 54,199 | $ 62,792 |  | $ 133,350 | $ 108,546 |  | $ 79,360 | $ 22,691 |  |  |  | $ 899 | $ 689 | $ 0 | $ 0 | $ 840 | $ 297 | $ 59 | $ 392 | $ 0 | $ 0 |
Consolidated revenues | 321,683 | 226,217 |  | 55,673 | 32,877 |  | 53,359 | 62,495 |  | 133,291 | 108,154 |  | 79,360 | 22,691 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross profit | 28,379 | 25,476 |  | (489) | 3,330 |  | 4,386 | 7,531 |  | 14,518 | 12,837 |  | 9,964 | 1,778 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating income | 8,547 | 10,762 |  | (3,656) | 1,300 |  | 578 | 3,263 |  | 7,103 | 5,832 |  | 4,522 | 367 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment assets | 548,314 |  | 568,932 | 116,255 |  | 120,264 | 81,071 |  | 72,406 | 179,996 |  | 200,493 | 100,734 |  | 105,049 | 70,258 | 70,720 |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 72,065 |  | $ 69,837 | $ 43,062 |  | $ 43,243 | $ 13,529 |  | $ 10,943 | $ 9,910 |  | $ 10,027 | $ 5,564 |  | $ 5,624 |  |  |  |  |  |  |  |  |  |  |  |  | $ 39,232

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