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Variable Interest Entities (VIEs) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Variable Interest Entity [Line Items]          
Assets, current $ 4,172,321,000   $ 4,172,321,000   $ 3,286,667,000
Liabilities, current 3,208,342,000   3,208,342,000   2,332,700,000
Future funding commitments 0   0    
Revenue $ 1,415,360,000 $ 1,082,816,000 $ 4,035,674,000 $ 3,259,273,000  
Purple Line Extension Section 2 and Section 3          
Variable Interest Entity [Line Items]          
Percent interest in the joint venture (as a percent)     75.00%    
Related Party | Purple Line Extension Section 2 and Section 3          
Variable Interest Entity [Line Items]          
Revenue     $ 2,800,000,000    
Related Party | Manhattan Jail Project          
Variable Interest Entity [Line Items]          
Revenue     $ 3,760,000,000    
Percent interest in the joint venture (as a percent)     75.00%    
O&G | Purple Line Extension Section 2 and Section 3          
Variable Interest Entity [Line Items]          
Noncontrolling interest, ownership percentage by noncontrolling owners (as a percent) 25.00%   25.00%    
O&G | Related Party | Manhattan Jail Project          
Variable Interest Entity [Line Items]          
Noncontrolling interest, ownership percentage by noncontrolling owners (as a percent) 25.00%   25.00%    
Variable Interest Entity, Not Primary Beneficiary          
Variable Interest Entity [Line Items]          
Assets, current $ 51,300,000   $ 51,300,000   26,700,000
Assets, noncurrent 6,200,000   6,200,000    
Liabilities, current 58,300,000   58,300,000   24,800,000
VIEs          
Variable Interest Entity [Line Items]          
Assets, current 1,000,000,000.0   1,000,000,000.0   475,600,000
Assets, noncurrent 32,400,000   32,400,000   19,900,000
Liabilities, current 738,500,000   738,500,000   $ 385,500,000
Liabilities, noncurrent $ 6,500,000   $ 6,500,000