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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
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Earn-out payments during period | $ 3,627 | $ 2,261 | $ 518
Level 3 Inputs |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Beginning balance | 7,610 | 4,834 |
Fair value of the earn-out liability associated with the MUSA-Galvanized / American Stainless acquisition | 6,366 | 3,800 |
Earn-out payments during period | (4,075) | (2,455) |
Changes in fair value during the period | (747) | 1,431 |
Ending balance | 9,154 | 7,610 | 4,834
MUSA-Stainless | Level 3 Inputs |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Beginning balance | 4,252 | 4,834 |
Fair value of the earn-out liability associated with the MUSA-Galvanized / American Stainless acquisition | 0 | 0 |
Earn-out payments during period | (1,634) | (2,164) |
Changes in fair value during the period | (215) | 1,582 |
Ending balance | 2,403 | 4,252 | 4,834
MUSA-Galvanized | Level 3 Inputs |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Beginning balance | 3,358 | 0 |
Fair value of the earn-out liability associated with the MUSA-Galvanized / American Stainless acquisition | 0 | 3,800 |
Earn-out payments during period | (712) | (291) |
Changes in fair value during the period | (864) | (151) |
Ending balance | 1,782 | 3,358 | 0
American Stainless | Level 3 Inputs |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Beginning balance | 0 | 0 |
Fair value of the earn-out liability associated with the MUSA-Galvanized / American Stainless acquisition | 6,366 | 0 |
Earn-out payments during period | (1,729) | 0 |
Changes in fair value during the period | 332 | 0 |
Ending balance | $ 4,969 | $ 0 | $ 0

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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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