Revenue (Schedule of Revenue by Contract Type) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Revenue	$ 1,127,470	$ 1,021,751	$ 2,176,457	$ 1,798,051
Adverse Legal Ruling Pertaining to Mixed-Use Project in New York
Disaggregation of Revenue [Line Items]
Loss contingency			(83,600)	83,600
Fixed price
Disaggregation of Revenue [Line Items]
Revenue	775,218	734,948	1,507,587	1,308,592
Guaranteed maximum price
Disaggregation of Revenue [Line Items]
Revenue	191,668	123,229	379,637	194,825
Unit price
Disaggregation of Revenue [Line Items]
Revenue	95,593	79,730	149,992	136,806
Cost plus fee and other
Disaggregation of Revenue [Line Items]
Revenue	64,991	83,844	139,241	157,828
Civil
Disaggregation of Revenue [Line Items]
Revenue	546,488	554,123	1,018,653	903,993
Civil | Fixed price
Disaggregation of Revenue [Line Items]
Revenue	452,823	488,343	875,543	799,716
Civil | Guaranteed maximum price
Disaggregation of Revenue [Line Items]
Revenue	88	(107)	134	(45)
Civil | Unit price
Disaggregation of Revenue [Line Items]
Revenue	75,313	58,662	109,167	91,674
Civil | Cost plus fee and other
Disaggregation of Revenue [Line Items]
Revenue	18,264	7,225	33,809	12,648
Building
Disaggregation of Revenue [Line Items]
Revenue	417,866	331,342	829,808	560,995
Building | Adverse Legal Ruling Pertaining to Mixed-Use Project in New York
Disaggregation of Revenue [Line Items]
Loss contingency			(72,200)	72,200
Building | Fixed price
Disaggregation of Revenue [Line Items]
Revenue	186,050	136,053	356,196	232,169
Building | Guaranteed maximum price
Disaggregation of Revenue [Line Items]
Revenue	190,643	125,070	377,943	194,848
Building | Unit price
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Building | Cost plus fee and other
Disaggregation of Revenue [Line Items]
Revenue	41,173	70,219	95,669	133,978
Specialty Contractors
Disaggregation of Revenue [Line Items]
Revenue	163,116	136,286	327,996	333,063
Specialty Contractors | Adverse Legal Ruling Pertaining to Mixed-Use Project in New York
Disaggregation of Revenue [Line Items]
Loss contingency			(11,400)	11,400
Specialty Contractors | Fixed price
Disaggregation of Revenue [Line Items]
Revenue	136,345	110,552	275,848	276,707
Specialty Contractors | Guaranteed maximum price
Disaggregation of Revenue [Line Items]
Revenue	937	(1,734)	1,560	22
Specialty Contractors | Unit price
Disaggregation of Revenue [Line Items]
Revenue	20,280	21,068	40,825	45,132
Specialty Contractors | Cost plus fee and other
Disaggregation of Revenue [Line Items]
Revenue	$ 5,554	$ 6,400	$ 9,763	$ 11,202