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Plateau Acquisition - Narrative (Details) - USD ($) $ in Thousands | Oct. 02, 2019 | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill |  | $ 192,014 | $ 191,892
Plateau Excavation |  |  |
Business Acquisition [Line Items] |  |  |
Total consideration | $ 427,533 |  |
Goodwill | $ 106,784 |  |

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