Revenue (Schedule of Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Disaggregation of Revenue [Line Items]
Revenue	$ 1,637,047	$ 1,373,681	$ 3,026,505	$ 2,620,314
State and local agencies
Disaggregation of Revenue [Line Items]
Revenue	1,054,633	849,513	1,955,910	1,602,981
Federal agencies
Disaggregation of Revenue [Line Items]
Revenue	165,556	160,545	293,236	312,385
Private owners
Disaggregation of Revenue [Line Items]
Revenue	416,858	363,623	777,359	704,948
Civil
Disaggregation of Revenue [Line Items]
Revenue	816,154	734,187	1,513,881	1,344,228
Civil \| State and local agencies
Disaggregation of Revenue [Line Items]
Revenue	639,433	546,827	1,183,641	987,937
Civil \| Federal agencies
Disaggregation of Revenue [Line Items]
Revenue	120,860	123,675	219,736	235,754
Civil \| Private owners
Disaggregation of Revenue [Line Items]
Revenue	55,861	63,685	110,504	120,537
Civil \| Mass transit (includes certain transportation and tunneling projects)
Disaggregation of Revenue [Line Items]
Revenue	476,375	420,683	926,166	773,868
Civil \| Military facilities
Disaggregation of Revenue [Line Items]
Revenue	101,289	101,559	183,597	202,687
Civil \| Bridges
Disaggregation of Revenue [Line Items]
Revenue	109,493	104,083	170,839	155,934
Civil \| Detention facilities
Disaggregation of Revenue [Line Items]
Revenue	40,127	38,726	69,422	84,713
Civil \| Power and energy
Disaggregation of Revenue [Line Items]
Revenue	32,183	38,057	65,308	68,668
Civil \| Other
Disaggregation of Revenue [Line Items]
Revenue	56,687	31,079	98,549	58,358
Building
Disaggregation of Revenue [Line Items]
Revenue	559,566	462,082	1,032,566	921,866
Building \| State and local agencies
Disaggregation of Revenue [Line Items]
Revenue	244,397	210,780	470,450	431,955
Building \| Federal agencies
Disaggregation of Revenue [Line Items]
Revenue	39,018	34,821	63,883	71,465
Building \| Private owners
Disaggregation of Revenue [Line Items]
Revenue	276,151	216,481	498,233	418,446
Building \| Mass transit (includes certain transportation and tunneling projects)
Disaggregation of Revenue [Line Items]
Revenue	14,292	35,718	46,304	65,228
Building \| Detention facilities
Disaggregation of Revenue [Line Items]
Revenue	139,675	75,911	256,120	163,915
Building \| Other
Disaggregation of Revenue [Line Items]
Revenue	36,432	17,160	56,284	36,877
Building \| Healthcare facilities
Disaggregation of Revenue [Line Items]
Revenue	295,484	233,426	541,267	447,974
Building \| Government
Disaggregation of Revenue [Line Items]
Revenue	44,849	63,106	77,792	123,121
Building \| Education facilities
Disaggregation of Revenue [Line Items]
Revenue	28,834	36,761	54,799	84,751
Specialty Contractors
Disaggregation of Revenue [Line Items]
Revenue	261,327	177,412	480,058	354,220
Specialty Contractors \| State and local agencies
Disaggregation of Revenue [Line Items]
Revenue	170,803	91,906	301,819	183,089
Specialty Contractors \| Federal agencies
Disaggregation of Revenue [Line Items]
Revenue	5,678	2,049	9,617	5,166
Specialty Contractors \| Private owners
Disaggregation of Revenue [Line Items]
Revenue	84,846	83,457	168,622	165,965
Specialty Contractors \| Mass transit (includes certain transportation and tunneling projects)
Disaggregation of Revenue [Line Items]
Revenue	64,783	56,173	122,787	98,768
Specialty Contractors \| Detention facilities
Disaggregation of Revenue [Line Items]
Revenue	55,212	5,730	83,741	12,382
Specialty Contractors \| Other
Disaggregation of Revenue [Line Items]
Revenue	18,566	9,035	38,071	28,167
Specialty Contractors \| Healthcare facilities
Disaggregation of Revenue [Line Items]
Revenue	44,131	23,883	84,383	44,457
Specialty Contractors \| Government
Disaggregation of Revenue [Line Items]
Revenue	18,100	26,098	35,372	56,194
Specialty Contractors \| Commercial and industrial facilities
Disaggregation of Revenue [Line Items]
Revenue	38,141	33,576	66,472	65,766
Specialty Contractors \| Multi-unit residential
Disaggregation of Revenue [Line Items]
Revenue	$ 22,394	$ 22,917	$ 49,232	$ 48,486