Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Details)

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Commitments and Contingencies (Details) - USD ($)
 1 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Sep. 30, 2014
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Metals Segment [Member] | Product Liability and Other Damages [Member]              
Product Liability Contingency [Line Items]              
Claim expense         $ 0 $ 0 $ 0
Palmer of Texas Customer Breach of Contract Case [Member] | Settled Litigation [Member]              
Product Liability Contingency [Line Items]              
Loss Contingency, Damages Awarded, Value $ 0            
Indemnified legal judgment 11,000,000       $ 0 11,000,000  
Synalloy Fabrication, LLC Customer Breach of Contract Case [Member] | Settled Litigation [Member]              
Product Liability Contingency [Line Items]              
Loss Contingency, Damages Awarded, Value     $ 3,100,000        
Litigation damages sought           $ 3,000,000  
Loss Contingency, Damages Paid, Value   $ 600,000 $ 2,500,000        
Synalloy Fabrication, LLC Customer Breach of Contract Case [Member] | Pending Litigation [Member]              
Product Liability Contingency [Line Items]              
Litigation damages sought       $ 3,300,000      
Palmer of Texas [Member] | Palmer of Texas Customer Breach of Contract Case [Member] | Settled Litigation [Member]              
Product Liability Contingency [Line Items]              
Claim expense 1,040,000            
Loss Contingency, Damages Awarded, Value $ 8,600,000