Annual report pursuant to Section 13 and 15(d)

Impairments and (Gain) Loss on Assets Held for Sale - Additional Information (Details)

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Impairments and (Gain) Loss on Assets Held for Sale - Additional Information (Details)
 12 Months Ended
Dec. 31, 2019
USD ($)
crane
machine
Deckbarge
Dec. 31, 2018
USD ($)
crane
machine
Deckbarge
Dec. 31, 2017
USD ($)
building
drydock
Long Lived Assets Held-for-sale [Line Items]      
Impairment of asset held for sale $ 8,166,000 $ 2,351,000 $ 989,000
Impairments of assets removed from AHFS 1,060,000    
Impairments of assets 17,223,000 4,445,000 7,672,000
Gain (loss) on sale of assets 369,000 7,724,000 (259,000)
Property, plant and equipment, net 70,484,000 79,930,000  
Proceeds from property insurance policy   9,362,000 1,544,000
Insured event, gain (loss)   3,571,000  
Proceeds from sale of property, plant and equipment 2,217,000 85,247,000 2,155,000
Fabrication      
Long Lived Assets Held-for-sale [Line Items]      
Impairment of asset held for sale 7,842,000 1,387,000  
Impairments of assets removed from AHFS 1,060,000    
Impairments of assets 8,700,000   6,700,000
Gain (loss) on disposition   8,000,000  
Inventory impairment   2,000,000  
Inventory scrap value   200,000  
Fabrication | Specialty and High-Grade Copper Nickel and Steel      
Long Lived Assets Held-for-sale [Line Items]      
Impairments of assets     3,700,000
Fabrication | Specialty Piping and Valves      
Long Lived Assets Held-for-sale [Line Items]      
Impairments of assets     3,000,000
Jennings Yard assets      
Long Lived Assets Held-for-sale [Line Items]      
Impairments of assets 4,578,000    
Lake Charles Yard assets      
Long Lived Assets Held-for-sale [Line Items]      
Impairments of assets 2,998,000    
Held for sale      
Long Lived Assets Held-for-sale [Line Items]      
Property, plant and equipment held for sale 9,006,000 18,935,000  
Fabrication Division | Held for sale      
Long Lived Assets Held-for-sale [Line Items]      
Property, plant and equipment held for sale $ 9,000,000 $ 18,000,000  
Number of cranes | crane 3 3  
Number of bending roll machines | machine 2 2  
Number of deck barges | Deckbarge 1 1  
Fabrication Division | Held for sale | Cranes and Plate Bending Roll Machines      
Long Lived Assets Held-for-sale [Line Items]      
Impairment of asset held for sale $ 7,800,000    
Shipyard Division | Held for sale      
Long Lived Assets Held-for-sale [Line Items]      
Impairment of asset held for sale   $ 1,000,000 $ 1,000,000
Number of drydocks | drydock     3
Number of drydocks sold | drydock     2
Proceeds from sale of property, plant and equipment     $ 2,000,000
Asset impairment and (gain) loss on assets held for sale, net     300,000
Shipyard Division | Held for sale | Drydock      
Long Lived Assets Held-for-sale [Line Items]      
Impairment of asset held for sale 300,000    
Proceeds from sale of assets $ 600,000    
South Texas Properties      
Long Lived Assets Held-for-sale [Line Items]      
Gain (loss) on disposition   (7,724,000)  
South Texas Properties | Fabrication      
Long Lived Assets Held-for-sale [Line Items]      
Gain (loss) on disposition   (7,724,000)  
South Texas Properties | Disposed of by sale      
Long Lived Assets Held-for-sale [Line Items]      
Proceeds from sale of productive assets   1,300,000  
Gain (loss) on sale of assets   (300,000)  
South Texas Fabrication Yards, South Yard | Disposed of by sale      
Long Lived Assets Held-for-sale [Line Items]      
Proceeds from sale of assets   55,000,000  
Proceeds from sale of productive assets   53,800,000  
Gain (loss) on disposition   3,900,000  
Selling costs   1,200,000  
South Texas Fabrication Yards, North Yard      
Long Lived Assets Held-for-sale [Line Items]      
Property, plant and equipment, net   800,000  
South Texas Fabrication Yards, North Yard | Disposed of by sale      
Long Lived Assets Held-for-sale [Line Items]      
Proceeds from sale of assets   28,000,000  
Proceeds from sale of productive assets   27,400,000  
Gain (loss) on disposition   4,100,000  
Selling costs   600,000  
Disposal group, not included in sale   18,800,000  
South Texas Fabrication Yards, North Yard, Assets Under Agreement To Sell | Held for sale      
Long Lived Assets Held-for-sale [Line Items]      
Impairment of asset held for sale   1,400,000  
Insurance recoveries     1,300,000
Insured event, gain (loss)   3,600,000 0
South Texas Fabrication Yards | Held for sale      
Long Lived Assets Held-for-sale [Line Items]      
Proceeds from property insurance policy   9,400,000 6,000,000
Insurance settlement   15,400,000  
South Texas Properties, Total Loss Of Buildings | Held for sale      
Long Lived Assets Held-for-sale [Line Items]      
Insurance recoveries     1,500,000
Insured event, gain (loss)     $ 0
South Texas Properties, Total Loss Of Buildings | Held for sale | Building      
Long Lived Assets Held-for-sale [Line Items]      
Number of buildings | building     2
Texas North Yard | Held for sale      
Long Lived Assets Held-for-sale [Line Items]      
Insurance recoveries   9,000,000  
Insured event, gain (loss)   $ 0