Revenue (Disaggregation Of Revenue) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 3,790,755	$ 4,641,830	$ 5,318,763
State and local agencies
Disaggregation of Revenue [Line Items]
Revenue	2,067,008	2,636,472	2,943,870
Federal agencies
Disaggregation of Revenue [Line Items]
Revenue	504,803	442,312	394,327
Private owners
Disaggregation of Revenue [Line Items]
Revenue	1,218,944	1,563,046	1,980,566
Civil
Disaggregation of Revenue [Line Items]
Revenue	1,734,882	2,095,760	2,199,899
Civil | State and local agencies
Disaggregation of Revenue [Line Items]
Revenue	1,273,639	1,791,531	1,875,653
Civil | Federal agencies
Disaggregation of Revenue [Line Items]
Revenue	313,791	205,080	175,933
Civil | Private owners
Disaggregation of Revenue [Line Items]
Revenue	147,452	99,149	148,313
Civil | Mass transit (includes certain transportation and tunneling projects)
Disaggregation of Revenue [Line Items]
Revenue	1,026,589	1,417,196	1,367,412
Civil | Bridges
Disaggregation of Revenue [Line Items]
Revenue	265,130	238,345	306,161
Civil | Military defense facilities
Disaggregation of Revenue [Line Items]
Revenue	258,028	194,701	146,969
Civil | Water
Disaggregation of Revenue [Line Items]
Revenue	88,983	98,739	101,705
Civil | Other
Disaggregation of Revenue [Line Items]
Revenue	96,152	146,779	277,652
Building
Disaggregation of Revenue [Line Items]
Revenue	1,242,571	1,428,102	1,984,641
Building | State and local agencies
Disaggregation of Revenue [Line Items]
Revenue	461,193	363,686	534,449
Building | Federal agencies
Disaggregation of Revenue [Line Items]
Revenue	168,307	189,508	143,327
Building | Private owners
Disaggregation of Revenue [Line Items]
Revenue	613,071	874,908	1,306,865
Building | Mass transit (includes certain transportation and tunneling projects)
Disaggregation of Revenue [Line Items]
Revenue	132,836	130,923	218,930
Building | Other
Disaggregation of Revenue [Line Items]
Revenue	71,074	90,316	132,308
Building | Municipal and government
Disaggregation of Revenue [Line Items]
Revenue	329,661	291,629	287,337
Building | Commercial and industrial facilities
Disaggregation of Revenue [Line Items]
Revenue	251,849	352,265	580,297
Building | Health care facilities
Disaggregation of Revenue [Line Items]
Revenue	178,997	64,042	117,968
Building | Education facilities
Disaggregation of Revenue [Line Items]
Revenue	140,514	159,929	173,472
Building | Hospitality and gaming
Disaggregation of Revenue [Line Items]
Revenue	137,640	338,998	474,329
Specialty Contractors
Disaggregation of Revenue [Line Items]
Revenue	813,302	1,117,968	1,134,223
Specialty Contractors | State and local agencies
Disaggregation of Revenue [Line Items]
Revenue	332,176	481,255	533,768
Specialty Contractors | Federal agencies
Disaggregation of Revenue [Line Items]
Revenue	22,705	47,724	75,067
Specialty Contractors | Private owners
Disaggregation of Revenue [Line Items]
Revenue	458,421	588,989	525,388
Specialty Contractors | Mass transit (includes certain transportation and tunneling projects)
Disaggregation of Revenue [Line Items]
Revenue	350,005	588,162	592,430
Specialty Contractors | Water
Disaggregation of Revenue [Line Items]
Revenue	79,553	90,887	73,769
Specialty Contractors | Other
Disaggregation of Revenue [Line Items]
Revenue	16,186	102,314	123,062
Specialty Contractors | Commercial and industrial facilities
Disaggregation of Revenue [Line Items]
Revenue	166,286	139,751	152,868
Specialty Contractors | Education facilities
Disaggregation of Revenue [Line Items]
Revenue	39,277	50,572	44,762
Specialty Contractors | Multi-unit residential
Disaggregation of Revenue [Line Items]
Revenue	112,944	133,085	139,924
Specialty Contractors | Federal government
Disaggregation of Revenue [Line Items]
Revenue	$ 49,051	$ 13,197	$ 7,408