Annual report pursuant to Section 13 and 15(d)

Quarterly Operating Results (Unaudited) - Summary of Quarterly Results of Operations (Parenthetical) (Details)

v3.19.3.a.u2
Quarterly Operating Results (Unaudited) - Summary of Quarterly Results of Operations (Parenthetical) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Quarterly Financial Information Disclosure [Line Items]            
Impairments and (gain) loss on assets held for sale       $ 17,528 $ (6,850) $ 7,931
Proceeds collection of receivables     $ 2,800      
Gain on sale   $ 4,100   584 (268) 35
Impairment charges related to inventory and assets   3,000        
Fabrication and Shipyard            
Quarterly Financial Information Disclosure [Line Items]            
Increase in operating loss due to project charges $ 13,800          
Fabrication, Shipyard and Services            
Quarterly Financial Information Disclosure [Line Items]            
Impairments and (gain) loss on assets held for sale $ 17,300          
Shipyard            
Quarterly Financial Information Disclosure [Line Items]            
Increase in operating loss due to project charges   $ 5,800   7,200 6,700 34,500
Impairments and (gain) loss on assets held for sale       $ 7,920 $ 964 $ 1,248