Quarterly report pursuant to Section 13 or 15(d)

Assets Held for Sale - Narrative (Details)

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Assets Held for Sale - Narrative (Details)
$ in Thousands
 3 Months Ended 9 Months Ended 13 Months Ended
Sep. 30, 2018
USD ($)
crane
Jun. 30, 2018
USD ($)
crane
building
Sep. 30, 2018
USD ($)
crane
T
Sep. 30, 2017
USD ($)
drydock
Sep. 30, 2018
USD ($)
crane
Sep. 26, 2018
USD ($)
Long Lived Assets Held-for-sale [Line Items]            
Gain on insurance recoveries, net     $ 3,342 $ 0    
Number of drydocks sold | drydock       2    
Disposal Group, Held-for-sale, Not Discontinued Operations | Texas South Yard            
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     53,500      
Gain (loss) on sale of assets     3,900      
Disposal Group, Held-for-sale, Not Discontinued Operations | Texas North Yard            
Long Lived Assets Held-for-sale [Line Items]            
Sale of PP&E $ 1,100   $ 1,100   $ 1,100 $ 28,000
Proceeds from deposits on real estate sales $ 500          
Insurance recoveries         $ 8,900  
Disposal Group, Held-for-sale, Not Discontinued Operations | Assets Under Agreement For Sale            
Long Lived Assets Held-for-sale [Line Items]            
Number of cranes held for sale | crane 3   3   3  
Asset impairment reversal $ 5,200          
Impairment of assets held for sale     $ 1,400      
Gain on insurance recoveries, net     $ 3,600      
Insurance recoveries   $ 5,200        
Disposal Group, Held-for-sale, Not Discontinued Operations | Assets Under Agreement For Sale | Building            
Long Lived Assets Held-for-sale [Line Items]            
Number of buildings | building   2        
Disposal Group, Held-for-sale, Not Discontinued Operations | Assets Under Agreement For Sale | Cranes            
Long Lived Assets Held-for-sale [Line Items]            
Number of cranes | crane   5        
Disposal Group, Held-for-sale, Not Discontinued Operations | South Texas Fabrication Yards            
Long Lived Assets Held-for-sale [Line Items]            
Insurance settlement   $ 15,400        
Insurance payment received $ 7,200          
Insurance recoveries         $ 1,300  
Disposal Group, Held-for-sale, Not Discontinued Operations | Shipyard Division Assets            
Long Lived Assets Held-for-sale [Line Items]            
Impairment of assets held for sale       $ 400    
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Shipyard Division Assets            
Long Lived Assets Held-for-sale [Line Items]            
Sale of PP&E       2,000    
Gain (loss) on sale of assets       $ (300)    
Drydock, number of tons | T     2,500