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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 |  |  |  |  |  |

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