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Variable Interest Entities (VIEs) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Variable Interest Entity [Line Items]          
Assets, current $ 3,451,780,000   $ 3,451,780,000   $ 3,521,354,000
Liabilities, current 2,232,130,000   2,232,130,000   2,124,953,000
Future funding commitments 0   0    
Revenue $ 1,082,816,000 $ 1,060,705,000 $ 3,259,273,000 $ 2,858,756,000  
Purple Line Extension Section 2 and Section 3          
Variable Interest Entity [Line Items]          
Percent interest in the joint venture     75.00%    
Newark Airport Terminal One Design Build Project          
Variable Interest Entity [Line Items]          
Percent interest in the joint venture     80.00%    
Related Party | Purple Line Extension Section 2 and Section 3          
Variable Interest Entity [Line Items]          
Revenue     $ 2,800,000,000    
O&G | Purple Line Extension Section 2 and Section 3          
Variable Interest Entity [Line Items]          
Noncontrolling interest, ownership percentage by noncontrolling owners 25.00%   25.00%    
Joint Venture With Parsons | Newark Airport Terminal One Design Build Project          
Variable Interest Entity [Line Items]          
Revenue     $ 1,400,000,000    
Parsons Corporation | Newark Airport Terminal One Design Build Project          
Variable Interest Entity [Line Items]          
Noncontrolling interest, ownership percentage by noncontrolling owners 20.00%   20.00%    
Variable Interest Entity, Not Primary Beneficiary          
Variable Interest Entity [Line Items]          
Assets, current $ 3,500,000   $ 3,500,000   500,000
Liabilities, current 100,000   100,000   100,000
VIEs          
Variable Interest Entity [Line Items]          
Assets, current 506,500,000   506,500,000   503,100,000
Liabilities, current 432,400,000   432,400,000   505,000,000
Assets, noncurrent $ 25,500,000   $ 25,500,000   $ 35,100,000