Revenue (Disaggregation Of Revenue) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
REVENUE	$ 4,641,830	$ 5,318,763	$ 4,450,832
State and local agencies
Disaggregation of Revenue [Line Items]
REVENUE	2,636,472	2,943,870	2,470,245
Federal agencies
Disaggregation of Revenue [Line Items]
REVENUE	442,312	394,327	281,662
Private owners
Disaggregation of Revenue [Line Items]
REVENUE	1,563,046	1,980,566	1,698,925
Civil
Disaggregation of Revenue [Line Items]
REVENUE	2,095,760	2,199,899	1,779,352
Civil | State and local agencies
Disaggregation of Revenue [Line Items]
REVENUE	1,791,531	1,875,653	1,401,001
Civil | Federal agencies
Disaggregation of Revenue [Line Items]
REVENUE	205,080	175,933	116,869
Civil | Private owners
Disaggregation of Revenue [Line Items]
REVENUE	99,149	148,313	261,482
Civil | Mass transit (includes certain transportation and tunneling projects)
Disaggregation of Revenue [Line Items]
REVENUE	1,417,196	1,367,412	992,755
Civil | Bridges
Disaggregation of Revenue [Line Items]
REVENUE	238,345	306,161	334,117
Civil | Military defense facilities
Disaggregation of Revenue [Line Items]
REVENUE	194,701	146,969	59,082
Civil | Water
Disaggregation of Revenue [Line Items]
REVENUE	98,739	101,705	33,370
Civil | Highways
Disaggregation of Revenue [Line Items]
REVENUE	55,666	122,254	86,747
Civil | Other
Disaggregation of Revenue [Line Items]
REVENUE	91,113	155,398	273,281
Building
Disaggregation of Revenue [Line Items]
REVENUE	1,428,102	1,984,641	1,742,040
Building | State and local agencies
Disaggregation of Revenue [Line Items]
REVENUE	363,686	534,449	573,049
Building | Federal agencies
Disaggregation of Revenue [Line Items]
REVENUE	189,508	143,327	153,467
Building | Private owners
Disaggregation of Revenue [Line Items]
REVENUE	874,908	1,306,865	1,015,524
Building | Mass transit (includes certain transportation and tunneling projects)
Disaggregation of Revenue [Line Items]
REVENUE	130,923	218,930	201,400
Building | Other
Disaggregation of Revenue [Line Items]
REVENUE	90,316	132,308	145,717
Building | Commercial and industrial facilities
Disaggregation of Revenue [Line Items]
REVENUE	352,265	580,297	459,806
Building | Hospitality and gaming
Disaggregation of Revenue [Line Items]
REVENUE	338,998	474,329	297,700
Building | Municipal and government
Disaggregation of Revenue [Line Items]
REVENUE	291,629	287,337	254,736
Building | Education facilities
Disaggregation of Revenue [Line Items]
REVENUE	159,929	173,472	143,382
Building | Health care facilities
Disaggregation of Revenue [Line Items]
REVENUE	64,042	117,968	239,299
Specialty Contractors
Disaggregation of Revenue [Line Items]
REVENUE	1,117,968	1,134,223	929,440
Specialty Contractors | State and local agencies
Disaggregation of Revenue [Line Items]
REVENUE	481,255	533,768	496,195
Specialty Contractors | Federal agencies
Disaggregation of Revenue [Line Items]
REVENUE	47,724	75,067	11,326
Specialty Contractors | Private owners
Disaggregation of Revenue [Line Items]
REVENUE	588,989	525,388	421,919
Specialty Contractors | Mass transit (includes certain transportation and tunneling projects)
Disaggregation of Revenue [Line Items]
REVENUE	588,162	592,430	419,402
Specialty Contractors | Water
Disaggregation of Revenue [Line Items]
REVENUE	90,887	73,769	37,403
Specialty Contractors | Other
Disaggregation of Revenue [Line Items]
REVENUE	70,851	83,448	67,382
Specialty Contractors | Commercial and industrial facilities
Disaggregation of Revenue [Line Items]
REVENUE	139,751	152,868	186,819
Specialty Contractors | Education facilities
Disaggregation of Revenue [Line Items]
REVENUE	50,572	44,762	70,229
Specialty Contractors | Mixed use
Disaggregation of Revenue [Line Items]
REVENUE	44,660	47,022	64,302
Specialty Contractors | Multi-unit residential
Disaggregation of Revenue [Line Items]
REVENUE	$ 133,085	$ 139,924	$ 83,903