Quarterly report pursuant to Section 13 or 15(d)

LEEVAC Transaction - Narrative (Details)

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LEEVAC Transaction - Narrative (Details)
 3 Months Ended 6 Months Ended
Jan. 01, 2016
USD ($)
ft²
a
employee
Customer
vessel
Project
ft
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Business Acquisition [Line Items]            
Total assets   $ 342,031,000 $ 356,391,000 $ 342,031,000 $ 356,391,000 $ 316,923,000
Liabilities   77,127,000   77,127,000   $ 59,726,000
Revenues   81,502,000 84,338,000 165,481,000 183,571,000  
Net income   5,540,000 $ 1,357,000 6,529,000 1,440,000  
Recognition of deferred revenue       2,654,000 $ 0  
LEEVAC            
Business Acquisition [Line Items]            
Purchase price $ 20,000,000          
Net cash received at closing 1,588,000          
Total assets   25,100,000   25,100,000    
Liabilities   24,300,000   24,300,000    
Revenues   17,300,000   39,100,000    
Net income   1,500,000   751,000    
Recognition of deferred revenue   $ 1,500,000   $ 2,700,000    
Build construction backlog acquired 119,100,000          
Build construction acquired, purchase price fair value allocated $ 7,100,000          
Number of build construction projects in backlog acquired | Project 4          
Third party customers with backlog acquired | Customer 2          
Employees hired upon acquisition | employee 380          
Jennings | LEEVAC            
Business Acquisition [Line Items]            
Area of leased facility | a 180          
Covered fabrication area acquired (greater than) | ft² 100,000          
Water frontage acquired | ft 3,000          
Lake Charles | LEEVAC            
Business Acquisition [Line Items]            
Area of leased facility | a 10          
Water frontage acquired | ft 1,100          
Houma | LEEVAC            
Business Acquisition [Line Items]            
Area of leased facility | a 35          
Monthly rental payment $ 67,000          
Lease expiration period after completion of vessels 90 days          
Number of vessels under construction at the leased facility | vessel 2