Annual report pursuant to Section 13 and 15(d)

LEEVAC Transaction - Narrative (Details)

v3.6.0.2
LEEVAC Transaction - Narrative (Details)
ft² in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Jan. 01, 2016
USD ($)
ft²
a
employee
Customer
vessel
Project
ft
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Business Acquisition [Line Items]                            
Total Assets $ 322,408,000   $ 322,408,000       $ 316,923,000       $ 322,408,000 $ 322,408,000 $ 316,923,000 $ 397,943,000
Liabilities 59,376,000   59,376,000       59,726,000       59,376,000 59,376,000 59,726,000  
Revenues     55,461,000 $ 65,384,000 $ 81,502,000 $ 83,979,000 55,018,000 $ 67,531,000 $ 84,338,000 $ 99,233,000   286,326,000 306,120,000 506,639,000
Net income (loss)     (3,555,000) $ 541,000 $ 5,540,000 $ 989,000 $ (14,667,000) $ (12,137,000) $ 1,357,000 $ 83,000   3,515,000 (25,364,000) 15,320,000
Recognition of deferred revenue                       5,223,000 0 $ 0
Business combination, initial accounting incomplete, adjustment to machinery and equipment     2,100,000                      
LEEVAC                            
Business Acquisition [Line Items]                            
Purchase price 20,000,000 $ 20,000,000                        
Net cash received at closing   1,600,000                        
Due from seller                     1,447,000      
Total Assets 52,200,000   52,200,000               52,200,000 52,200,000    
Liabilities $ 54,000,000   $ 54,000,000               54,000,000 54,000,000    
Revenues                       75,600,000 87,239,000  
Net income (loss)                       (1,800,000) $ (4,655,000)  
Recognition of deferred revenue                       $ 5,200,000    
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)      
Decrease in working capital assumed                     3,565,000      
Net cash received from seller                     $ 2,118,000      
Jennings Shipyard | LEEVAC                            
Business Acquisition [Line Items]                            
Area of leased facility (in acres) | a   180                        
Covered fabrication area acquired (greater than) | ft²   100                        
Water frontage acquired | ft   3,000                        
Lake Charles Shipyard | LEEVAC                            
Business Acquisition [Line Items]                            
Area of leased facility (in acres) | a   10                        
Water frontage acquired | ft   1,100                        
Prospect Shipyard | LEEVAC                            
Business Acquisition [Line Items]                            
Area of leased facility (in acres) | 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