Annual report pursuant to Section 13 and 15(d)

Impairments and (Gain) Loss on Assets Held for Sale - Summary of Impairments and (Gain) Loss on Assets Held for Sale (Details)

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Impairments and (Gain) Loss on Assets Held for Sale - Summary of Impairments and (Gain) Loss on Assets Held for Sale (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Long Lived Assets Held-for-sale [Line Items]        
Gain on sale of South Texas Properties, net       $ 7,700
Impairments of AHFS   $ 1,400 $ 8,166 2,351
Impairments of assets removed from AHFS     1,060  
Impairments of assets   3,310 17,223 4,445
(Gain) loss on AHFS and other   821 305  
Gain from insurance proceeds       (3,571)
Total   4,130 17,528 (6,850)
South Texas Properties        
Long Lived Assets Held-for-sale [Line Items]        
Gain on sale of South Texas Properties, net       (7,724)
Shipyard        
Long Lived Assets Held-for-sale [Line Items]        
Impairments of AHFS     324 964
Impairments of assets   1,600 7,900 1,000
(Gain) loss on AHFS and other   598 20  
Total $ 1,600 1,639 7,920 964
F&S        
Long Lived Assets Held-for-sale [Line Items]        
Impairments of AHFS   1,400 7,842 1,387
Impairments of assets removed from AHFS     1,060  
(Gain) loss on AHFS and other   223 (369)  
Gain from insurance proceeds       (3,571)
Total   2,491 8,933 (7,814)
F&S | South Texas Properties        
Long Lived Assets Held-for-sale [Line Items]        
Gain on sale of South Texas Properties, net       (7,724)
Corporate        
Long Lived Assets Held-for-sale [Line Items]        
(Gain) loss on AHFS and other     654  
Total     675  
Jennings Yard assets        
Long Lived Assets Held-for-sale [Line Items]        
Impairments of assets   29 4,578  
Jennings Yard assets | Shipyard        
Long Lived Assets Held-for-sale [Line Items]        
Impairments of assets   29 4,578  
Lake Charles Yard assets        
Long Lived Assets Held-for-sale [Line Items]        
Impairments of AHFS 1,000      
Impairments of assets   1,006 2,998  
Lake Charles Yard assets | Shipyard        
Long Lived Assets Held-for-sale [Line Items]        
Impairments of assets   1,006 2,998  
Other Assets        
Long Lived Assets Held-for-sale [Line Items]        
Impairments of assets $ 900 874    
Other Assets | Shipyard        
Long Lived Assets Held-for-sale [Line Items]        
Impairments of assets   6    
Other Assets | F&S        
Long Lived Assets Held-for-sale [Line Items]        
Impairments of assets   $ 868    
Inventory And Other Assets        
Long Lived Assets Held-for-sale [Line Items]        
Impairments of assets     421 2,094
Inventory And Other Assets | F&S        
Long Lived Assets Held-for-sale [Line Items]        
Impairments of assets     400 $ 2,094
Inventory And Other Assets | Corporate        
Long Lived Assets Held-for-sale [Line Items]        
Impairments of assets     $ 21