Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Disaggregation of Revenue [Line Items]
Revenues	$ 410,131	$ 353,471
Consolidation, Eliminations
Disaggregation of Revenue [Line Items]
Revenues	(71,499)	(48,296)
Operating Segments Excluding Intersegment Elimination
Disaggregation of Revenue [Line Items]
Revenues	409,993	353,398
West \| Consolidation, Eliminations
Disaggregation of Revenue [Line Items]
Revenues	(42,876)	(28,899)
West \| Operating Segments Excluding Intersegment Elimination
Disaggregation of Revenue [Line Items]
Revenues	210,984	208,018
Mountain \| Consolidation, Eliminations
Disaggregation of Revenue [Line Items]
Revenues	(8,608)	(3,645)
Mountain \| Operating Segments Excluding Intersegment Elimination
Disaggregation of Revenue [Line Items]
Revenues	81,236	65,994
Central \| Consolidation, Eliminations
Disaggregation of Revenue [Line Items]
Revenues	(10,579)	(8,478)
Central \| Operating Segments Excluding Intersegment Elimination
Disaggregation of Revenue [Line Items]
Revenues	101,194	67,841
Energy Services \| Consolidation, Eliminations
Disaggregation of Revenue [Line Items]
Revenues	(5,642)	(3,678)
Energy Services \| Operating Segments Excluding Intersegment Elimination
Disaggregation of Revenue [Line Items]
Revenues	16,579	11,545
Corporate Services and Eliminations \| Corporate, Non-Segment & Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Revenues	138	73
Corporate Services and Eliminations \| Consolidation, Eliminations
Disaggregation of Revenue [Line Items]
Revenues	(3,794)	(3,596)
Aggregates
Disaggregation of Revenue [Line Items]
Revenues	103,513	81,392
Aggregates \| West
Disaggregation of Revenue [Line Items]
Revenues	64,772	56,257
Aggregates \| Mountain
Disaggregation of Revenue [Line Items]
Revenues	13,564	8,043
Aggregates \| Central
Disaggregation of Revenue [Line Items]
Revenues	25,177	17,092
Aggregates \| Energy Services
Disaggregation of Revenue [Line Items]
Revenues	0	0
Aggregates \| Corporate Services and Eliminations
Disaggregation of Revenue [Line Items]
Revenues	0	0
Ready-mix concrete
Disaggregation of Revenue [Line Items]
Revenues	144,545	108,458
Ready-mix concrete \| West
Disaggregation of Revenue [Line Items]
Revenues	73,951	69,780
Ready-mix concrete \| Mountain
Disaggregation of Revenue [Line Items]
Revenues	22,636	13,087
Ready-mix concrete \| Central
Disaggregation of Revenue [Line Items]
Revenues	47,958	25,591
Ready-mix concrete \| Energy Services
Disaggregation of Revenue [Line Items]
Revenues	0	0
Ready-mix concrete \| Corporate Services and Eliminations
Disaggregation of Revenue [Line Items]
Revenues	0	0
Asphalt
Disaggregation of Revenue [Line Items]
Revenues	20,975	16,134
Asphalt \| West
Disaggregation of Revenue [Line Items]
Revenues	12,759	8,866
Asphalt \| Mountain
Disaggregation of Revenue [Line Items]
Revenues	2,797	498
Asphalt \| Central
Disaggregation of Revenue [Line Items]
Revenues	5,419	6,770
Asphalt \| Energy Services
Disaggregation of Revenue [Line Items]
Revenues	0	0
Asphalt \| Corporate Services and Eliminations
Disaggregation of Revenue [Line Items]
Revenues	0	0
Liquid asphalt
Disaggregation of Revenue [Line Items]
Revenues	18,192	12,228
Liquid asphalt \| West
Disaggregation of Revenue [Line Items]
Revenues	0	0
Liquid asphalt \| Mountain
Disaggregation of Revenue [Line Items]
Revenues	0	0
Liquid asphalt \| Central
Disaggregation of Revenue [Line Items]
Revenues	0	0
Liquid asphalt \| Energy Services
Disaggregation of Revenue [Line Items]
Revenues	18,192	12,228
Liquid asphalt \| Corporate Services and Eliminations
Disaggregation of Revenue [Line Items]
Revenues	0	0
Other
Disaggregation of Revenue [Line Items]
Revenues	46,588	43,491
Other \| West
Disaggregation of Revenue [Line Items]
Revenues	34,609	34,406
Other \| Mountain
Disaggregation of Revenue [Line Items]
Revenues	1	3
Other \| Central
Disaggregation of Revenue [Line Items]
Revenues	4,017	2,418
Other \| Energy Services
Disaggregation of Revenue [Line Items]
Revenues	4,029	2,995
Other \| Corporate Services and Eliminations
Disaggregation of Revenue [Line Items]
Revenues	3,932	3,669
Contracting services public-sector
Disaggregation of Revenue [Line Items]
Revenues	114,056	99,227
Contracting services public-sector \| West
Disaggregation of Revenue [Line Items]
Revenues	47,406	38,772
Contracting services public-sector \| Mountain
Disaggregation of Revenue [Line Items]
Revenues	40,041	36,179
Contracting services public-sector \| Central
Disaggregation of Revenue [Line Items]
Revenues	26,609	24,276
Contracting services public-sector \| Energy Services
Disaggregation of Revenue [Line Items]
Revenues	0	0
Contracting services public-sector \| Corporate Services and Eliminations
Disaggregation of Revenue [Line Items]
Revenues	0	0
Contracting services private-sector
Disaggregation of Revenue [Line Items]
Revenues	33,761	40,837
Contracting services private-sector \| West
Disaggregation of Revenue [Line Items]
Revenues	20,363	28,836
Contracting services private-sector \| Mountain
Disaggregation of Revenue [Line Items]
Revenues	10,805	11,829
Contracting services private-sector \| Central
Disaggregation of Revenue [Line Items]
Revenues	2,593	172
Contracting services private-sector \| Energy Services
Disaggregation of Revenue [Line Items]
Revenues	0	0
Contracting services private-sector \| Corporate Services and Eliminations
Disaggregation of Revenue [Line Items]
Revenues	$ 0	$ 0