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At-the-Market Equity Offerings - Additional Information (Detail) - Class A - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 09, 2022
Jun. 14, 2021
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
At Market Equity Offerings [Line Items]            
Common stock, shares issued       18,038,000   18,006,000
Jefferies LLC | 2021 Open Market Offering            
At Market Equity Offerings [Line Items]            
Cumulative aggregate offering price of shares sold under the agreement   $ 1,000.0        
Maximum commission percentage on stock sales   2.00%        
2021 Open Market Offering | Jefferies LLC            
At Market Equity Offerings [Line Items]            
Cumulative aggregate offering price of shares sold under the agreement           $ 1,000.0
Common stock, shares issued     555,179   555,179  
Common stock, average price per share     $ 727.64   $ 727.64  
Sales commissions and expenses     $ 4.5   $ 4.5  
Proceeds from sale of class A common stock under public offerings     $ 399.5   $ 399.5  
Sales Agents | 2022 Sales Agreement            
At Market Equity Offerings [Line Items]            
Maximum commission percentage on stock sales 2.00%          
Common stock, shares issued       0    
Sales commissions and expenses       $ 0.4    
Aggregate offering $ 500.0