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Plateau Acquisition - Schedule of Identifiable Intangible Assets (Details) - USD ($) $ in Thousands |  | 9 Months Ended
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Oct. 02, 2019 | Sep. 30, 2020
Business Acquisition [Line Items] |  |
Weighted Average Life (Years) |  | 24 years
Plateau Excavation |  |
Business Acquisition [Line Items] |  |
Fair Value | $ 218,600 |
Customer relationships |  |
Business Acquisition [Line Items] |  |
Weighted Average Life (Years) |  | 25 years
Customer relationships | Plateau Excavation |  |
Business Acquisition [Line Items] |  |
Weighted Average Life (Years) | 25 years |
Fair Value | $ 191,800 |
Trade name |  |
Business Acquisition [Line Items] |  |
Weighted Average Life (Years) |  | 23 years
Trade name | Plateau Excavation |  |
Business Acquisition [Line Items] |  |
Weighted Average Life (Years) | 25 years |
Fair Value | $ 24,800 |
Non-competition agreements |  |
Business Acquisition [Line Items] |  |
Weighted Average Life (Years) |  | 5 years
Non-competition agreements | Plateau Excavation |  |
Business Acquisition [Line Items] |  |
Weighted Average Life (Years) | 5 years |
Fair Value | $ 2,000 |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + 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 increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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