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Related Party Transactions - Executive Officers - Narrative (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
employee
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
employee
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Earn-Out Liabilities          
Related Party Transaction [Line Items]          
Acquisition-related contingent consideration liabilities, payments $ 800,000 $ 0 $ 47,000,000 $ 50,400,000  
Management | Subcontracting Arrangements          
Related Party Transaction [Line Items]          
Number of management members, subcontracting arrangement | employee 2   2    
Expenses, related party $ 41,100,000 0 $ 86,900,000 600,000  
Payables, related party 7,100,000   7,100,000   $ 1,400,000
Chairman, Board of Directors | Lease Agreements          
Related Party Transaction [Line Items]          
Expenses, related party 600,000 600,000 1,900,000 1,900,000  
Executive Officers | Related Customer          
Related Party Transaction [Line Items]          
Receivables, related party 800,000   800,000   900,000
Charges, related party 300,000 300,000 900,000 1,000,000  
Executive Officers | Construction Services          
Related Party Transaction [Line Items]          
Expenses, related party     300,000 200,000  
Payables, related party 0   $ 0   $ 0
Revenue, related party   $ 700,000   $ 6,200,000  
Immediate Family Member of Management | Construction Management Firm Specializing in Steel Building Systems | Earn-Out Liabilities          
Related Party Transaction [Line Items]          
Acquisition-related contingent consideration liabilities, payments $ 800,000