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Fair Value of Financial Instruments - Summary of Changes in Fair Value of Company's Earn-Out Liability (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Earn-out payments during period | $ 3,946 | $ 3,627
Level 3 Inputs |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning balance | 9,154 | 7,610
Fair value of the earn-out liability associated with the American Stainless (ASTI) acquisition |  | 6,366
Earn-out payments during period | (4,238) | (4,075)
Changes in fair value during the period | (1,195) | (747)
Ending balance | 3,721 | 9,154
MUSA-Stainless | Level 3 Inputs |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning balance | 2,403 | 4,252
Fair value of the earn-out liability associated with the American Stainless (ASTI) acquisition |  | 0
Earn-out payments during period | (1,625) | (1,634)
Changes in fair value during the period | (403) | (215)
Ending balance | 375 | 2,403
MUSA-Galvanized | Level 3 Inputs |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning balance | 1,782 | 3,358
Fair value of the earn-out liability associated with the American Stainless (ASTI) acquisition |  | 0
Earn-out payments during period | (611) | (712)
Changes in fair value during the period | (230) | (864)
Ending balance | 941 | 1,782
American Stainless | Level 3 Inputs |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning balance | 4,969 | 0
Fair value of the earn-out liability associated with the American Stainless (ASTI) acquisition |  | 6,366
Earn-out payments during period | (2,002) | (1,729)
Changes in fair value during the period | (562) | 332
Ending balance | $ 2,405 | $ 4,969

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- Definition Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Earn-Out Liability + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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