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Variable Interest Entities (VIEs) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Variable Interest Entity [Line Items]          
Assets, current $ 3,898,222,000   $ 3,898,222,000   $ 3,286,667,000
Liabilities, current 2,955,930,000   2,955,930,000   2,332,700,000
Future funding commitments 0   0    
Revenue $ 1,373,681,000 $ 1,127,470,000 $ 2,620,314,000 $ 2,176,457,000  
Purple Line Extension Section 2 and Section 3          
Variable Interest Entity [Line Items]          
Percent interest in the joint venture     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     75.00%    
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%    
O&G | Related Party | Manhattan Jail Project          
Variable Interest Entity [Line Items]          
Noncontrolling interest, ownership percentage by noncontrolling owners 25.00%   25.00%    
Variable Interest Entity, Not Primary Beneficiary          
Variable Interest Entity [Line Items]          
Assets, current $ 45,800,000   $ 45,800,000   26,700,000
Assets, noncurrent 3,800,000   3,800,000    
Liabilities, current 53,200,000   53,200,000   24,800,000
VIEs          
Variable Interest Entity [Line Items]          
Assets, current 798,800,000   798,800,000   475,600,000
Assets, noncurrent 25,300,000   25,300,000   19,900,000
Liabilities, current 576,300,000   576,300,000   $ 385,500,000
Liabilities, noncurrent $ 7,000,000   $ 7,000,000