Revenue (Disaggregation Of Revenue) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
REVENUE	$ 3,880,227	$ 3,790,755	$ 4,641,830
State and local agencies
Disaggregation of Revenue [Line Items]
REVENUE	2,285,319	2,067,008	2,636,472
Federal agencies
Disaggregation of Revenue [Line Items]
REVENUE	573,675	504,803	442,312
Private owners
Disaggregation of Revenue [Line Items]
REVENUE	1,021,233	1,218,944	1,563,046
Civil
Disaggregation of Revenue [Line Items]
REVENUE	1,883,865	1,734,882	2,095,760
Civil | State and local agencies
Disaggregation of Revenue [Line Items]
REVENUE	1,250,740	1,273,639	1,791,531
Civil | Federal agencies
Disaggregation of Revenue [Line Items]
REVENUE	400,782	313,791	205,080
Civil | Private owners
Disaggregation of Revenue [Line Items]
REVENUE	232,343	147,452	99,149
Civil | Mass transit (includes certain transportation and tunneling projects)
Disaggregation of Revenue [Line Items]
REVENUE	1,079,629	1,026,589	1,417,196
Civil | Military facilities
Disaggregation of Revenue [Line Items]
REVENUE	348,133	258,028	194,701
Civil | Bridges
Disaggregation of Revenue [Line Items]
REVENUE	204,029	265,130	238,345
Civil | Commercial and industrial sites
Disaggregation of Revenue [Line Items]
REVENUE	118,880	70,708	70,099
Civil | Other
Disaggregation of Revenue [Line Items]
REVENUE	133,194	114,427	175,419
Building
Disaggregation of Revenue [Line Items]
REVENUE	1,302,539	1,242,571	1,428,102
Building | State and local agencies
Disaggregation of Revenue [Line Items]
REVENUE	718,106	461,193	363,686
Building | Federal agencies
Disaggregation of Revenue [Line Items]
REVENUE	187,199	168,307	189,508
Building | Private owners
Disaggregation of Revenue [Line Items]
REVENUE	397,234	613,071	874,908
Building | Mass transit (includes certain transportation and tunneling projects)
Disaggregation of Revenue [Line Items]
REVENUE	188,335	132,836	130,923
Building | Other
Disaggregation of Revenue [Line Items]
REVENUE	(23,485)	43,300	66,001
Building | Government
Disaggregation of Revenue [Line Items]
REVENUE	424,130	329,661	291,629
Building | Health care facilities
Disaggregation of Revenue [Line Items]
REVENUE	294,667	178,997	64,042
Building | Education facilities
Disaggregation of Revenue [Line Items]
REVENUE	226,335	140,514	159,929
Building | Commercial and industrial facilities
Disaggregation of Revenue [Line Items]
REVENUE	77,118	251,849	352,265
Building | Hospitality and gaming
Disaggregation of Revenue [Line Items]
REVENUE	59,771	137,640	338,998
Building | Sports and entertainment
Disaggregation of Revenue [Line Items]
REVENUE	55,668	27,774	24,315
Specialty Contractors
Disaggregation of Revenue [Line Items]
REVENUE	693,823	813,302	1,117,968
Specialty Contractors | State and local agencies
Disaggregation of Revenue [Line Items]
REVENUE	316,473	332,176	481,255
Specialty Contractors | Federal agencies
Disaggregation of Revenue [Line Items]
REVENUE	(14,306)	22,705	47,724
Specialty Contractors | Private owners
Disaggregation of Revenue [Line Items]
REVENUE	391,656	458,421	588,989
Specialty Contractors | Mass transit (includes certain transportation and tunneling projects)
Disaggregation of Revenue [Line Items]
REVENUE	119,760	350,005	588,162
Specialty Contractors | Commercial and industrial sites
Disaggregation of Revenue [Line Items]
REVENUE	213,003	166,286	139,751
Specialty Contractors | Other
Disaggregation of Revenue [Line Items]
REVENUE	15,045	20,089	118,040
Specialty Contractors | Government
Disaggregation of Revenue [Line Items]
REVENUE	89,031	61,424	18,476
Specialty Contractors | Health care facilities
Disaggregation of Revenue [Line Items]
REVENUE	57,292	23,001	29,567
Specialty Contractors | Multi-unit residential
Disaggregation of Revenue [Line Items]
REVENUE	114,516	112,944	133,085
Specialty Contractors | Water
Disaggregation of Revenue [Line Items]
REVENUE	$ 85,176	$ 79,553	$ 90,887