Revenues and Gross Profit - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Revenue Recognition [Line Items]
Gross profit	$ 335	$ 272
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	$ 297	246
Service revenues	1,353	1,251
Interproduct Revenues
Revenue Recognition [Line Items]
Service revenues	(49)	(39)
West Group | Operating Segments
Revenue Recognition [Line Items]
Service revenues	667	644
Service | CALIFORNIA and COLORADO | West Group
Revenue Recognition [Line Items]
Service revenues	$ 36	$ 26
Minimum | Service
Revenue Recognition [Line Items]
Performance obligations, period	1 day
Maximum | Service
Revenue Recognition [Line Items]
Performance obligations, period	2 years