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Revenues and Gross Profit - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Revenue Recognition [Line Items] |  |  |  |
Performance obligations, description of timing |  |  | Performance obligations within paving service agreements are satisfied over time, primarily ranging from one day to two years. Customer payments for the paving operations are based on a contractual billing schedule and are typically "paid-when-paid", meaning the Company is paid once the customer is paid. |
Future revenues from unsatisfied performance obligations | $ 252 | $ 377 | $ 252 | $ 377
Service revenues | 1,811 | 1,764 | 3,164 | 3,015
Service | CALIFORNIA and COLORADO | West Group |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Service revenues | $ 102 | $ 117 | $ 137 | $ 143
Minimum | Service |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Performance obligations, period |  |  | 1 day |
Maximum | Service |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Performance obligations, period |  |  | 2 years |

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