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Acquisitions (Details Textual) (USD $) | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2013 Kvaerner North American Construction [Member] | Jun. 30, 2014 Kvaerner North American Construction [Member] | Dec. 21, 2013 Kvaerner North American Construction [Member] | Jun. 30, 2014 MXPB Power Partners [Member] | Dec. 21, 2013 MXPB Power Partners [Member]
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock acquired, percent |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |
Acquisition price |  |  |  |  |  |  |  |  |  |  |  | $ 88,262,000 |  |  |  |
Goodwill | 69,837,000 |  |  |  | 30,836,000 |  |  |  | 69,837,000 | 30,836,000 | 28,675,000 | 39,076,000 |  |  |  |
Tax deductible goodwill |  |  |  |  |  |  |  |  |  |  |  | 30,700,000 |  |  |  |
Ownership interest in joint venture, percent |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 65.00% |
Equity of joint venture acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000
Company's portion of joint venture equity acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,300,000
Noncontrolling interest in joint venture | 1,767,000 |  |  |  | 0 |  |  |  | 1,767,000 | 0 |  |  |  |  | 1,800,000 | 700,000
Revenues |  |  |  |  |  |  |  |  | 1,263,089,000 | 892,574,000 | 739,046,000 |  | 154,800,000 |  |  |
Operating income | 14,209,000 | 18,819,000 | 14,817,000 | 10,762,000 | 11,587,000 | 8,431,000 | 8,722,000 | 7,924,000 | 58,607,000 | 36,714,000 | 31,635,000 |  | 2,700,000 |  |  |
Acquisition-related expenses |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  |  |
Incremental intangible amortization expense |  |  |  |  |  |  |  |  | 4,100,000 |  |  |  |  |  |  |
Depreciation expenses |  |  |  |  |  |  |  |  |  | 1,300,000 |  |  |  |  |  |
Income from one-time tax settlement |  |  |  |  |  |  |  |  | $ 600,000 |  |  |  |  |  |  |

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition For transactions that are recognized separately from the acquisition of assets and assumptions of liabilities in the business combination, such as related to pre-existing relationships with the acquiree, this element represents the disclosure of the amount of acquisition related costs which have been expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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