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Goodwill and Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Changes in Carrying Amount of Goodwill | The following table presents the changes in the carrying amount of goodwill since its inception through September 30, 2025:
(in thousands) |  | Civil |  | Building |  | Specialty Contractors |  | Total
Gross goodwill as of December 31, 2024 |  | $ | 492,074 |  |  | $ | 424,724 |  |  | $ | 156,193 |  |  | $ | 1,072,991 |
Accumulated impairment as of December 31, 2024 |  | (286,931) |  |  | (424,724) |  |  | (156,193) |  |  | (867,848) |
Goodwill as of December 31, 2024 |  | 205,143 |  |  | — |  |  | — |  |  | 205,143 |
Current year activity |  | — |  |  | — |  |  | — |  |  | — |
Goodwill as of September 30, 2025 |  | $ | 205,143 |  |  | $ | — |  |  | $ | — |  |  | $ | 205,143 |
Schedule of Intangible Assets | Intangible assets consist of the following:
|  | As of September 30, 2025 |  | Weighted-Average Amortization Period
(in thousands) |  | Cost |  | Accumulated Amortization |  | Accumulated Impairment Charge |  | Carrying Value |
Trade names (non-amortizable) |  | $ | 117,600 |  |  | $ | — |  |  | $ | (67,190) |  |  | $ | 50,410 |  |  | Indefinite
Trade names (amortizable) |  | 69,250 |  |  | (32,037) |  |  | (23,232) |  |  | 13,981 |  |  | 20 years
Contractor license |  | 6,000 |  |  | — |  |  | (6,000) |  |  | — |  |  | N/A
Customer relationships |  | 39,800 |  |  | (23,155) |  |  | (16,645) |  |  | — |  |  | N/A
Construction contract backlog |  | 149,290 |  |  | (149,290) |  |  | — |  |  | — |  |  | N/A
Total |  | $ | 381,940 |  |  | $ | (204,482) |  |  | $ | (113,067) |  |  | $ | 64,391 |  |  |
|  | As of December 31, 2024 |  | Weighted-Average Amortization Period
(in thousands) |  | Cost |  | Accumulated Amortization |  | Accumulated Impairment Charge |  | Carrying Value |
Trade names (non-amortizable) |  | $ | 117,600 |  |  | $ | — |  |  | $ | (67,190) |  |  | $ | 50,410 |  |  | Indefinite
Trade names (amortizable) |  | 69,250 |  |  | (30,359) |  |  | (23,232) |  |  | 15,659 |  |  | 20 years
Contractor license |  | 6,000 |  |  | — |  |  | (6,000) |  |  | — |  |  | N/A
Customer relationships |  | 39,800 |  |  | (23,155) |  |  | (16,645) |  |  | — |  |  | N/A
Construction contract backlog |  | 149,290 |  |  | (149,290) |  |  | — |  |  | — |  |  | N/A
Total |  | $ | 381,940 |  |  | $ | (202,804) |  |  | $ | (113,067) |  |  | $ | 66,069 |  |  |

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