Revenue (Schedule of Revenue by Contract Type) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Revenue	$ 1,048,987	$ 776,300
Adverse Legal Ruling Pertaining to Mixed-Use Project in New York
Disaggregation of Revenue [Line Items]
Loss contingency		83,600
Fixed price
Disaggregation of Revenue [Line Items]
Revenue	732,369	573,644
Guaranteed maximum price
Disaggregation of Revenue [Line Items]
Revenue	187,969	71,596
Unit price
Disaggregation of Revenue [Line Items]
Revenue	54,399	57,076
Cost plus fee and other
Disaggregation of Revenue [Line Items]
Revenue	74,250	73,984
Civil
Disaggregation of Revenue [Line Items]
Revenue	472,165	349,870
Civil | Fixed price
Disaggregation of Revenue [Line Items]
Revenue	422,720	311,373
Civil | Guaranteed maximum price
Disaggregation of Revenue [Line Items]
Revenue	46	62
Civil | Unit price
Disaggregation of Revenue [Line Items]
Revenue	33,854	33,012
Civil | Cost plus fee and other
Disaggregation of Revenue [Line Items]
Revenue	15,545	5,423
Building
Disaggregation of Revenue [Line Items]
Revenue	411,942	229,653
Building | Adverse Legal Ruling Pertaining to Mixed-Use Project in New York
Disaggregation of Revenue [Line Items]
Loss contingency		72,200
Building | Fixed price
Disaggregation of Revenue [Line Items]
Revenue	170,146	96,116
Building | Guaranteed maximum price
Disaggregation of Revenue [Line Items]
Revenue	187,300	69,778
Building | Unit price
Disaggregation of Revenue [Line Items]
Revenue	0	0
Building | Cost plus fee and other
Disaggregation of Revenue [Line Items]
Revenue	54,496	63,759
Specialty Contractors
Disaggregation of Revenue [Line Items]
Revenue	164,880	196,777
Specialty Contractors | Adverse Legal Ruling Pertaining to Mixed-Use Project in New York
Disaggregation of Revenue [Line Items]
Loss contingency		11,400
Specialty Contractors | Fixed price
Disaggregation of Revenue [Line Items]
Revenue	139,503	166,155
Specialty Contractors | Guaranteed maximum price
Disaggregation of Revenue [Line Items]
Revenue	623	1,756
Specialty Contractors | Unit price
Disaggregation of Revenue [Line Items]
Revenue	20,545	24,064
Specialty Contractors | Cost plus fee and other
Disaggregation of Revenue [Line Items]
Revenue	$ 4,209	$ 4,802