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Plateau Acquisition - Consideration Transferred and Purchase Price Allocation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | Oct. 02, 2019 | Sep. 30, 2020 | Dec. 31, 2019
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Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract] |  |  |
Goodwill |  | $ 192,014 | $ 191,892
Plateau Excavation |  |  |
Business Acquisition [Line Items] |  |  |
Cash consideration transferred, net of $2,425 of cash acquired | $ 375,000 |  |
Target working capital adjustment | 21,323 |  |
Share consideration given for acquisitions | 16,195 |  |
Note payable to seller | 10,000 |  |
Tax basis election | 5,015 |  |
Total consideration | 427,533 |  |
Cash acquired | $ 2,425 |  |
Equity consideration transferred (in shares) | 1,245 |  |
Business acquisition, price per share | $ 13.01 |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract] |  |  |
Accounts receivable, including retainage | $ 81,921 |  |
Costs and estimated earnings in excess of billings | 974 |  |
Other current assets | 249 |  |
Property and equipment, net | 65,492 |  |
Other non-current assets, net | 10 |  |
Accounts payable | (22,039) |  |
Billings in excess of costs and estimated earnings | (16,540) |  |
Other current and non-current liabilities | (7,918) |  |
Total net tangible assets | 102,149 |  |
Identifiable intangible assets | 218,600 |  |
Goodwill | 106,784 |  |
Total consideration transferred | $ 427,533 |  |

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