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Common Equity and Earnings per Share - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Jun. 14, 2021
Sep. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Class of Stock          
Preferred stock, shares issued   0 0   0
Preferred stock, shares outstanding   0 0   0
Jefferies LLC | Sale Agreement          
Class of Stock          
Commission percentage in sales     2.00%    
Class A          
Class of Stock          
Common stock, votes per share     one    
Common stock, shares issued   17,078,000 17,078,000   16,307,000
Proceeds from sale of class A common stock under public offerings     $ 403,970 $ 0  
Class A | Jefferies LLC | Sale Agreement          
Class of Stock          
Aggregate offering $ 1,000,000        
Common stock, shares issued   555,179 555,179    
Common stock, average price per share   $ 727.64 $ 727.64    
Sales Commissions and Expenses   $ 4,500 $ 4,500    
Proceeds from sale of class A common stock under public offerings   399,500 399,500    
Available for issuance and sale pursuant to sale agreement   $ 596,000 $ 596,000    
Class B Convertible          
Class of Stock          
Common stock, votes per share     10    
Common stock, shares issued   1,964,000 1,964,000   1,964,000