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Acquisitions (Details) (USD $)
 3 Months Ended 0 Months Ended 0 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Jun. 30, 2014
Aug. 23, 2014
HDB, Inc. [Member]
Aug. 22, 2014
HDB, Inc. [Member]
Dec. 21, 2013
Kvaerner NAC
Sep. 30, 2014
Kvaerner NAC
Business Acquisition [Line Items]              
Business Acquisition, Name of Acquired Entity       HDB Ltd. Limited Partnership ("HDB").   Kvaerner North American Construction Ltd. and substantially all of the assets of Kvaerner North American Construction Inc  
Current assets         $ 1,658,000 $ 83,575,000  
Property, plant and equipment         1,162,000 11,377,000  
Goodwill 72,065,000   69,837,000     39,232,000  
Other intangible assets         900,000 24,009,000  
Total assets acquired         6,306,000 158,193,000  
Current liabilities         1,056,000 68,115,000  
Deferred income taxes           1,116,000  
Noncontrolling interest of consolidated joint venture           700,000 500,000
Net assets acquired         5,250,000 88,262,000  
Cash acquired           36,655,000  
Net purchase price 5,250,000 0       51,607,000  
Business Acquisition, Goodwill, Expected Tax Deductible Amount         2,586,000 28,500,000  
Business Combination, Consideration Transferred       $ 5,250,000   $ 88,300,000