Quarterly report pursuant to Section 13 or 15(d)

Assets Held for Sale - Additional Information (Details)

v3.20.2
Assets Held for Sale - Additional Information (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
crane
Deckbarge
Jun. 30, 2019
USD ($)
Long Lived Assets Held-for-sale [Line Items]        
Gain (loss) on sale of assets     $ 5,000 $ 565,000
Held for sale        
Long Lived Assets Held-for-sale [Line Items]        
Number of cranes | crane     3  
Number of deck barges | Deckbarge     1  
Proceeds from sale of bending roll machines $ 0 $ 0 $ 1,100,000 400,000
Gain (loss) on sale of assets $ 0 $ 0 $ 0 400,000
Impairment of long-lived assets to be disposed of       $ 300,000