Quarterly report pursuant to Section 13 or 15(d)

Assets Held for Sale - Narrative (Details)

v3.10.0.1
Assets Held for Sale - Narrative (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 10 Months Ended
Apr. 20, 2018
USD ($)
Jan. 03, 2018
USD ($)
Jun. 30, 2018
USD ($)
crane
building
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
drydock
Mar. 31, 2017
USD ($)
Jun. 30, 2018
USD ($)
T
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 28, 2017
USD ($)
Long Lived Assets Held-for-sale [Line Items]                      
Insurance receivable     $ 7,197   $ 0     $ 7,197   $ 7,197  
Gain on insurance recoveries, net               3,342 $ 0    
Number of drydocks sold | drydock           2          
Disposal Group, Held-for-sale, Not Discontinued Operations                      
Long Lived Assets Held-for-sale [Line Items]                      
Property, plant and equipment held for sale     43,797         43,797   43,797  
South Texas Fabrication Yards | Disposal Group, Held-for-sale, Not Discontinued Operations                      
Long Lived Assets Held-for-sale [Line Items]                      
Sale of PP&E $ 55,000                    
Cost of PP&E sales 1,500                    
Proceeds from sale of PP&E $ 52,700 $ 800                  
Gain (loss) on sale of assets     3,900                
Insurance settlement                     $ 15,400
Insurance initial payment                   8,200  
Insurance receivable     7,200         7,200   7,200  
Clean-up and repair related costs due to Hurricane Harvey                   1,600  
Cost of property repairs and maintenance, deductibles                   300  
Gain on insurance recoveries, net     $ 3,600                
South Texas Fabrication Yards | Disposal Group, Held-for-sale, Not Discontinued Operations | Building                      
Long Lived Assets Held-for-sale [Line Items]                      
Number of buildings | building     2                
South Texas Fabrication Yards | Disposal Group, Held-for-sale, Not Discontinued Operations | Cranes                      
Long Lived Assets Held-for-sale [Line Items]                      
Number of cranes | crane     5                
Texas North Yard | Disposal Group, Held-for-sale, Not Discontinued Operations                      
Long Lived Assets Held-for-sale [Line Items]                      
Insurance recoveries                   8,900  
Impairment of real estate       $ 5,100           8,900  
Impairment of assets held for sale       $ 800              
Property, plant and equipment held for sale     $ 41,908         41,908   41,908  
Shipyard Division Assets | Disposal Group, Held-for-sale, Not Discontinued Operations                      
Long Lived Assets Held-for-sale [Line Items]                      
Impairment of assets held for sale     600   $ 600   $ 400   400    
Property, plant and equipment held for sale     1,889         $ 1,889   1,889  
Shipyard Division Assets | Disposal Group, Disposed of by Sale, Not Discontinued Operations                      
Long Lived Assets Held-for-sale [Line Items]                      
Sale of PP&E           $ 2,000     $ 2,000    
Gain (loss) on sale of assets           $ (300)          
Drydock, number of tons | T               2,500      
Property, plant and equipment held for sale     $ 1,900         $ 1,900   $ 1,900