Revenue (Schedule of Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Revenue	$ 1,415,360	$ 1,082,816	$ 4,035,674	$ 3,259,273
State and local agencies(a)
Disaggregation of Revenue [Line Items]
Revenue	919,991	610,241	2,522,972	1,894,571
Federal agencies
Disaggregation of Revenue [Line Items]
Revenue	147,575	173,636	459,960	499,317
Private owners
Disaggregation of Revenue [Line Items]
Revenue	347,794	298,939	1,052,742	865,385
Civil
Disaggregation of Revenue [Line Items]
Revenue	770,234	545,895	2,114,462	1,564,548
Civil \| State and local agencies(a)
Disaggregation of Revenue [Line Items]
Revenue	601,597	325,543	1,589,534	955,157
Civil \| Federal agencies
Disaggregation of Revenue [Line Items]
Revenue	117,852	137,110	353,606	369,876
Civil \| Private owners
Disaggregation of Revenue [Line Items]
Revenue	50,785	83,242	171,322	239,515
Civil \| Mass transit (includes certain transportation and tunneling projects)
Disaggregation of Revenue [Line Items]
Revenue	466,226	341,827	1,240,094	883,930
Civil \| Military facilities
Disaggregation of Revenue [Line Items]
Revenue	86,696	110,214	289,383	333,137
Civil \| Bridges
Disaggregation of Revenue [Line Items]
Revenue	122,081	1,539	278,015	91,519
Civil \| Detention facilities
Disaggregation of Revenue [Line Items]
Revenue	31,818	22,216	116,531	29,088
Civil \| Power and energy
Disaggregation of Revenue [Line Items]
Revenue	40,288	34,456	108,956	96,382
Civil \| Commercial and industrial sites
Disaggregation of Revenue [Line Items]
Revenue	19,745	31,463	67,053	107,583
Civil \| Other
Disaggregation of Revenue [Line Items]
Revenue	3,380	4,180	14,430	22,909
Building
Disaggregation of Revenue [Line Items]
Revenue	418,664	435,715	1,340,530	1,265,523
Building \| State and local agencies(a)
Disaggregation of Revenue [Line Items]
Revenue	181,817	241,584	613,772	736,220
Building \| Federal agencies
Disaggregation of Revenue [Line Items]
Revenue	23,721	40,616	95,186	132,753
Building \| Private owners
Disaggregation of Revenue [Line Items]
Revenue	213,126	153,515	631,572	396,550
Building \| Mass transit (includes certain transportation and tunneling projects)
Disaggregation of Revenue [Line Items]
Revenue	25,615	64,861	90,843	183,359
Building \| Detention facilities
Disaggregation of Revenue [Line Items]
Revenue	99,129	49,762	263,044	108,302
Building \| Healthcare facilities
Disaggregation of Revenue [Line Items]
Revenue	224,392	160,904	672,366	408,845
Building \| Government
Disaggregation of Revenue [Line Items]
Revenue	28,864	61,278	151,985	247,467
Building \| Education facilities
Disaggregation of Revenue [Line Items]
Revenue	25,578	74,624	110,329	226,973
Building \| Other
Disaggregation of Revenue [Line Items]
Revenue	15,086	24,286	51,963	90,577
Specialty Contractors
Disaggregation of Revenue [Line Items]
Revenue	226,462	101,206	580,682	429,202
Specialty Contractors \| State and local agencies(a)
Disaggregation of Revenue [Line Items]
Revenue	136,577	43,114	319,666	203,194
Specialty Contractors \| Federal agencies
Disaggregation of Revenue [Line Items]
Revenue	6,002	(4,090)	11,168	(3,312)
Specialty Contractors \| Private owners
Disaggregation of Revenue [Line Items]
Revenue	83,883	62,182	249,848	229,320
Specialty Contractors \| Mass transit (includes certain transportation and tunneling projects)
Disaggregation of Revenue [Line Items]
Revenue	75,648	22,674	174,416	119,626
Specialty Contractors \| Detention facilities
Disaggregation of Revenue [Line Items]
Revenue	12,714	209	25,096	629
Specialty Contractors \| Healthcare facilities
Disaggregation of Revenue [Line Items]
Revenue	27,424	15,566	71,881	46,994
Specialty Contractors \| Government
Disaggregation of Revenue [Line Items]
Revenue	20,071	13,815	63,883	54,839
Specialty Contractors \| Education facilities
Disaggregation of Revenue [Line Items]
Revenue	5,812	8,566	13,937	22,828
Specialty Contractors \| Commercial and industrial facilities
Disaggregation of Revenue [Line Items]
Revenue	39,628	27,811	105,394	86,234
Specialty Contractors \| Multi-unit residential
Disaggregation of Revenue [Line Items]
Revenue	27,941	16,623	76,427	61,647
Specialty Contractors \| Water
Disaggregation of Revenue [Line Items]
Revenue	4,493	10,544	20,789	39,462
Specialty Contractors \| Other
Disaggregation of Revenue [Line Items]
Revenue	$ 12,731	$ (14,602)	$ 28,859	$ (3,057)