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Summary of Significant Accounting Policies - Narrative (Details) |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2019 USD ($) | Jul. 01, 2018 | Feb. 28, 2017 | Dec. 31, 2019 USD ($) subsidiaries reporting_unit segments | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Accounting Policies [Line Items] |  |  |  |  |  |
Number of operating segments | segments |  |  |  | 2 |  |
Number of reportable segments | segments |  |  |  | 2 |  |
Goodwill impairment |  |  |  | $ 0 | $ 0 |
Deferred charges and intangible assets |  |  |  | 32,600,000 | 23,200,000 |
Accumulated amortization on deferred charges |  |  |  | 16,600,000 | 13,000,000 |
Amortization expense |  |  |  | 3,500,000 | 2,400,000 | $ 2,400,000
Shipping costs |  |  |  | 10,900,000 | 9,800,000 | 7,500,000
Research and development expense |  |  |  | 600,000 | 500,000 | $ 600,000
Total lease liabilities |  |  |  | 37,285,000 |  |
Right-of-use assets, operating leases, net |  |  |  | 35,772,000 | 0 |
Deferred tax assets |  |  |  | $ 790,000 | 253,000 |
Accounting Standards Update 2016-02 |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Total lease liabilities | $ 33,100,000 |  |  |  |  |
Right-of-use assets, operating leases, net | 32,200,000 |  |  |  |  |
Cumulative adjustment |  |  |  |  | 4,623,000 |
Deferred tax assets | 1,300,000 |  |  |  |  |
Accounting Standards Update 2016-02 | Retained Earnings |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Cumulative adjustment | $ 4,600,000 |  |  |  | 4,623,000 |
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 |  |  |  | 13 years |  |
MUSA-Stainless | Customer List |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Amortization period for intangible assets |  |  |  | 15 years |  |
MUSA-Stainless | Earn-Out Payment |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Contingent consideration earn-out period |  |  | 4 years |  |  |
Earn out payments, target percentage |  |  | 3.00% |  |  |
MUSA-Galvanized |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Contingent consideration earn-out period |  | 4 years |  |  |  |
Earn out payments, target percentage |  | 3.00% |  |  |  |
MUSA-Galvanized | Customer List |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Amortization period for intangible assets |  | 15 years |  |  |  |
MUSA-Galvanized | Earn-Out Payment |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Contingent consideration earn-out period |  | 4 years |  |  |  |
Obsolescence Reserve |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Inventory reserves |  |  |  | $ 300,000 | 300,000 |
Physical Inventory Shrink Reserve |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Inventory reserves |  |  |  | $ 400,000 | $ 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 |  |
Minimum | Deferred Charges |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Amortization period for intangible assets |  |  |  | 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 |  |
Maximum | Deferred Charges |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Amortization period for intangible assets |  |  |  | 10 years |  |
American Stainless | American Stainless Tubing, Inc. |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Contingent consideration earn-out period | 3 years |  |  |  |  |
American Stainless | American Stainless Tubing, Inc. | Earn-Out Payment |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Earn out payments, target percentage | 6.50% |  |  |  |  |
Metals Segment |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Number of reporting units | reporting_unit |  |  |  | 3 |  |
Number of subsidiaries | subsidiaries |  |  |  | 4 |  |
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 | subsidiaries |  |  |  | 2 |  |
Specialty Chemicals Segment | Manufacturers Soap and Chemical Company |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Ownership percentage of subsidiary |  |  |  | 100.00% |  |

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