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Equity Method Investments - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Schedule Of Results Related To Equity Accounted Investees [Line Items]      
Undistributed earnings of equity method investees $ 39,400,000 $ 26,600,000  
Reimbursable costs included in revenues of equity method investees 4,102,900,000 3,851,500,000 $ 3,516,100,000
Provision for income taxes 89,425,000 82,976,000 $ 69,065,000
Investees      
Schedule Of Results Related To Equity Accounted Investees [Line Items]      
Provision for income taxes 0    
Other Assets      
Schedule Of Results Related To Equity Accounted Investees [Line Items]      
Amounts due from related parties included in other assets $ 1,600,000 $ 2,500,000