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
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Long Lived Assets Held-for-sale [Line Items]      
Impairments of AHFS $ 8,166 $ 2,351 $ 989
Impairments of assets removed from AHFS 1,060    
Impairments of assets 17,223 4,445 7,672
(Gain) loss on AHFS and other 305    
Gain from insurance proceeds   (3,571)  
Other     259
Total 17,528 (6,850) 7,931
South Texas Properties      
Long Lived Assets Held-for-sale [Line Items]      
Gain on sale of South Texas Properties, net   (7,724)  
Fabrication      
Long Lived Assets Held-for-sale [Line Items]      
Gain on sale of South Texas Properties, net   8,000  
Impairments of AHFS 7,842 1,387  
Impairments of assets removed from AHFS 1,060    
Impairments of assets 8,700   6,700
(Gain) loss on AHFS and other (369)    
Gain from insurance proceeds   (3,571)  
Total 8,651 (7,896) 6,683
Fabrication | 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 324 964 989
Impairments of assets 7,900 1,000 1,200
(Gain) loss on AHFS and other 20    
Other     259
Total 7,920 964 1,248
Services      
Long Lived Assets Held-for-sale [Line Items]      
Total 282 82  
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 4,578    
Jennings Yard assets | Shipyard      
Long Lived Assets Held-for-sale [Line Items]      
Impairments of assets 4,578    
Lake Charles Yard assets      
Long Lived Assets Held-for-sale [Line Items]      
Impairments of assets 2,998    
Lake Charles Yard assets | Shipyard      
Long Lived Assets Held-for-sale [Line Items]      
Impairments of assets 2,998    
Inventory and Other Assets      
Long Lived Assets Held-for-sale [Line Items]      
Impairments of assets 421 2,094 6,683
Inventory and Other Assets | Fabrication      
Long Lived Assets Held-for-sale [Line Items]      
Impairments of assets 118 2,012 $ 6,683
Inventory and Other Assets | Services      
Long Lived Assets Held-for-sale [Line Items]      
Impairments of assets 282 $ 82  
Inventory and Other Assets | Corporate      
Long Lived Assets Held-for-sale [Line Items]      
Impairments of assets $ 21