Quarterly report pursuant to Section 13 or 15(d)

LEEVAC Acquisition - Narrative (Details)

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LEEVAC Acquisition - Narrative (Details)
ft² in Thousands, $ in Thousands
 3 Months Ended
Jan. 01, 2016
USD ($)
ft²
a
employee
Customer
vessel
Project
ft
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Business Acquisition [Line Items]      
Revenues   $ 83,979 $ 99,233
Net income (loss)   989 $ 83
LEEVAC      
Business Acquisition [Line Items]      
Purchase price $ 20,000    
Net cash due to the Company at closing 1,588    
Build construction backlog acquired $ 112,000    
Number of build construction projects in backlog acquired | Project 4    
Third party customers with backlog acquired | Customer 2    
Employees hired upon acquisition | employee 380    
Revenues   21,800  
Net income (loss)   $ (706)  
Jennings | LEEVAC      
Business Acquisition [Line Items]      
Area of leased facility | a 180    
Covered fabrication area acquired | ft² 100    
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 40    
Monthly rental payment $ 67    
Lease expiration period after completion of vessels 90 days    
Number of vessels under construction at the leased facility | vessel 2