Revenue (Schedule of Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Disaggregation of Revenue [Line Items]
Revenue	$ 1,389,458	$ 1,246,633
State and local agencies
Disaggregation of Revenue [Line Items]
Revenue	901,277	753,468
Federal agencies
Disaggregation of Revenue [Line Items]
Revenue	127,680	151,840
Private owners
Disaggregation of Revenue [Line Items]
Revenue	360,501	341,325
Civil
Disaggregation of Revenue [Line Items]
Revenue	697,727	610,041
Civil \| State and local agencies
Disaggregation of Revenue [Line Items]
Revenue	544,208	441,110
Civil \| Federal agencies
Disaggregation of Revenue [Line Items]
Revenue	98,876	112,079
Civil \| Private owners
Disaggregation of Revenue [Line Items]
Revenue	54,643	56,852
Civil \| Mass transit (includes certain transportation and tunneling projects)
Disaggregation of Revenue [Line Items]
Revenue	449,791	353,185
Civil \| Military facilities
Disaggregation of Revenue [Line Items]
Revenue	82,308	101,128
Civil \| Bridges
Disaggregation of Revenue [Line Items]
Revenue	61,346	51,851
Civil \| Power and energy
Disaggregation of Revenue [Line Items]
Revenue	33,125	30,611
Civil \| Detention facilities
Disaggregation of Revenue [Line Items]
Revenue	29,295	45,987
Civil \| Other
Disaggregation of Revenue [Line Items]
Revenue	41,862	27,279
Building
Disaggregation of Revenue [Line Items]
Revenue	473,000	459,784
Building \| State and local agencies
Disaggregation of Revenue [Line Items]
Revenue	226,053	221,175
Building \| Federal agencies
Disaggregation of Revenue [Line Items]
Revenue	24,865	36,644
Building \| Private owners
Disaggregation of Revenue [Line Items]
Revenue	222,082	201,965
Building \| Mass transit (includes certain transportation and tunneling projects)
Disaggregation of Revenue [Line Items]
Revenue	32,012	29,510
Building \| Detention facilities
Disaggregation of Revenue [Line Items]
Revenue	116,445	88,004
Building \| Government
Disaggregation of Revenue [Line Items]
Revenue	32,943	60,015
Building \| Healthcare facilities
Disaggregation of Revenue [Line Items]
Revenue	245,783	214,548
Building \| Education facilities
Disaggregation of Revenue [Line Items]
Revenue	25,965	47,990
Building \| Other
Disaggregation of Revenue [Line Items]
Revenue	19,852	19,717
Specialty Contractors
Disaggregation of Revenue [Line Items]
Revenue	218,731	176,808
Specialty Contractors \| State and local agencies
Disaggregation of Revenue [Line Items]
Revenue	131,016	91,183
Specialty Contractors \| Federal agencies
Disaggregation of Revenue [Line Items]
Revenue	3,939	3,117
Specialty Contractors \| Private owners
Disaggregation of Revenue [Line Items]
Revenue	83,776	82,508
Specialty Contractors \| Mass transit (includes certain transportation and tunneling projects)
Disaggregation of Revenue [Line Items]
Revenue	58,004	42,595
Specialty Contractors \| Detention facilities
Disaggregation of Revenue [Line Items]
Revenue	28,529	6,652
Specialty Contractors \| Government
Disaggregation of Revenue [Line Items]
Revenue	17,272	23,444
Specialty Contractors \| Commercial and industrial facilities
Disaggregation of Revenue [Line Items]
Revenue	28,331	32,190
Specialty Contractors \| Healthcare facilities
Disaggregation of Revenue [Line Items]
Revenue	40,252	20,574
Specialty Contractors \| Multi-unit residential
Disaggregation of Revenue [Line Items]
Revenue	26,838	25,569
Specialty Contractors \| Other
Disaggregation of Revenue [Line Items]
Revenue	$ 19,505	$ 25,784