Quarterly report pursuant to Section 13 or 15(d)

LEEVAC Transaction - Narrative (Details)

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LEEVAC Transaction - Narrative (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Jan. 01, 2016
USD ($)
ft²
a
employee
Customer
vessel
Project
ft
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Business Acquisition [Line Items]                
Total assets $ 337,212,000     $ 337,212,000 $ 337,036,000 $ 337,212,000 $ 337,036,000 $ 316,923,000
Liabilities 71,097,000     71,097,000   71,097,000   $ 59,726,000
Revenues       65,384,000 67,531,000 230,864,000 251,102,000  
Net income (loss)       541,000 (12,137,000) 7,069,000 (10,697,000)  
Recognition of deferred revenue           4,114,000 0  
LEEVAC                
Business Acquisition [Line Items]                
Purchase price 20,000,000 $ 20,000,000 $ 20,000,000          
Net cash received at closing 1,588,000 $ 1,588,000 1,600,000 1,588,000   1,588,000    
Due from seller       1,497,000        
Total assets 21,400,000     21,400,000   21,400,000    
Liabilities $ 21,100,000     21,100,000   21,100,000    
Revenues       16,800,000 20,024,000 55,900,000 69,117,000  
Net income (loss)       (471,000) $ 1,215,000 280,000 $ (5,359,000)  
Recognition of deferred revenue       1,500,000   $ 4,100,000    
Build construction backlog acquired     121,200,000          
Build construction acquired, purchase price fair value allocated     $ 9,200,000          
Number of build construction projects in backlog acquired | Project     4          
Third party customers with backlog acquired | Customer     2          
Employees hired upon acquisition | employee     380          
Seller payment for prepaid contracts       (2,118,000)        
Working capital assumed       (3,615,000)        
Business combination, initial accounting incomplete, adjustment to machinery and equipment       $ 2,118,000        
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