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Summary of Significant Accounting Policies - Narrative (Details) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) subsidiary | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) reporting_unit subsidiary segment | Dec. 31, 2019 USD ($) | Jan. 01, 2020 USD ($)
Accounting Policies [Line Items] |  |  |  |  |  |
Number of operating segments | segment |  |  |  | 2 |  |
Number of reportable segments | segment |  |  |  | 2 |  |
Inventory write-down |  |  |  | $ 3,800,000 | $ 200,000 |
Goodwill impairment |  |  |  | 16,203,000 | 0 |
Deferred charges and intangible assets | $ 31,700,000 |  |  | 31,700,000 | 32,600,000 |
Accumulated amortization on deferred charges | 19,800,000 |  |  | 19,800,000 | 16,600,000 |
Amortization expense |  |  |  | 3,028,000 | 3,486,000 |
Shipping costs |  |  |  | 8,000,000.0 | 10,900,000 |
Research and development expense |  |  |  | 500,000 | 600,000 |
Retained earnings | 42,835,000 |  |  | 42,835,000 | 70,552,000 |
Total lease liabilities | 33,638,000 |  |  | 33,638,000 |  |
Right-of-use assets, operating leases, net | 31,769,000 |  |  | 31,769,000 | 35,772,000 |
Deferred tax assets | 1,957,000 |  |  | $ 1,957,000 | 790,000 |
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Retained earnings |  |  |  |  |  | $ 400,000
Software Licenses |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Useful life of property, plant and equipment |  |  |  | 5 years |  |
Customer List |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Weighted average amortization period for intangible assets |  |  |  | 11 years |  |
Estimated fair market value |  |  | $ 0 |  |  |
Impairment charge |  |  | $ 1,300,000 |  |  |
MUSA-Galvanized | Earn-Out Payment |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Period for which earn out payments will be received |  |  |  | 4 years |  |
MUSA-Stainless | Earn-Out Payment |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Period for which earn out payments will be received |  |  |  | 4 years |  |
Obsolescence Reserve |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Inventory reserves | 200,000 |  |  | $ 200,000 | 300,000 |
Physical Inventory Shrink Reserve |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Inventory reserves | $ 500,000 |  |  | $ 500,000 | $ 400,000 |
Minimum |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Accounts receivable, payment terms |  |  |  | 30 days |  |
Amortization period for intangible assets |  |  |  | 8 years |  |
Minimum | Land Improvement and Buildings |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Useful life of property, plant and equipment |  |  |  | 10 years |  |
Minimum | Machinery, Fixtures and Equipment |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Useful life of property, plant and equipment |  |  |  | 3 years |  |
Maximum |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Accounts receivable, payment terms |  |  |  | 60 days |  |
Amortization period for intangible assets |  |  |  | 15 years |  |
Maximum | Land Improvement and Buildings |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Useful life of property, plant and equipment |  |  |  | 40 years |  |
Maximum | Machinery, Fixtures and Equipment |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Useful life of property, plant and equipment |  |  |  | 20 years |  |
American Stainless | American Stainless Tubing, Inc. | Earn-Out Payment |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Period for which earn out payments will be received |  |  |  | 3 years |  |
Earn out payments, target percentage | 6.50% |  |  | 6.50% |  |
Metals Segment |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Number of reporting units | reporting_unit |  |  |  | 3 |  |
Number of subsidiaries | subsidiary | 4 |  |  | 4 |  |
Goodwill impairment | $ 5,500,000 | $ 10,700,000 |  | $ 16,203,000 |  |
Metals Segment | Synalloy Metals, Inc. |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Ownership percentage of subsidiary |  |  |  | 100.00% |  |
Specialty Chemicals Segment |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Number of reporting units | reporting_unit |  |  |  | 1 |  |
Number of subsidiaries | subsidiary | 2 |  |  | 2 |  |
Goodwill impairment | $ 0 |  |  | $ 0 |  |
Specialty Chemicals Segment | Manufacturers Soap and Chemical Company |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Ownership percentage of subsidiary |  |  |  | 100.00% |  |

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