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Information with Respect to Class A Common Shares that were Surrendered or Repurchased (Detail) - Class A Common Shares - USD ($)
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Equity, Class of Treasury Stock [Line Items]    
Shares repurchased [1] 468,860 15,954
Average Price Paid Per Share [1] $ 27.04 $ 25.94
Total Number of Shares Purchased as Part of Publicly Announced Plan or Program [1]   0
Approximate Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs [1]   $ 0
January 1-31, 2023 | Employee    
Equity, Class of Treasury Stock [Line Items]    
Shares repurchased [1],[2] 3,302  
Average Price Paid Per Share [1] $ 23.31  
Total Number of Shares Purchased as Part of Publicly Announced Plan or Program [1] 0  
Approximate Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs [1],[3] $ 0  
January 1-31, 2023 | $135 Million Share Repurchase Program    
Equity, Class of Treasury Stock [Line Items]    
Shares repurchased [1],[4] 250,000  
Average Price Paid Per Share [1] $ 25.9  
Total Number of Shares Purchased as Part of Publicly Announced Plan or Program [1] 250,000  
Approximate Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs [1],[3] $ 106,604,066  
April 1-30, 2023 | $135 Million Share Repurchase Program    
Equity, Class of Treasury Stock [Line Items]    
Shares repurchased [1],[4] 200,000  
Average Price Paid Per Share [1] $ 28  
Total Number of Shares Purchased as Part of Publicly Announced Plan or Program [1] 200,000  
Approximate Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs [1],[3] $ 101,004,066  
June 1-30, 2023 | Employee    
Equity, Class of Treasury Stock [Line Items]    
Shares repurchased [1],[4] 15,558  
Average Price Paid Per Share [1] $ 33.74  
Total Number of Shares Purchased as Part of Publicly Announced Plan or Program [1] 0  
Approximate Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs [1],[3] $ 101,004,066  
January 1-31, 2022 | Employee    
Equity, Class of Treasury Stock [Line Items]    
Shares repurchased [1],[2]   4,781
Average Price Paid Per Share [1]   $ 25.13
Total Number of Shares Purchased as Part of Publicly Announced Plan or Program [1]   0
Approximate Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs [1]   $ 0
June 1-30, 2022 | Employee    
Equity, Class of Treasury Stock [Line Items]    
Shares repurchased [1],[2]   11,173
Average Price Paid Per Share [1]   $ 26.28
Total Number of Shares Purchased as Part of Publicly Announced Plan or Program [1]   0
Approximate Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs [1]   $ 0
[1] Based on settlement date.
[2] Surrendered by employees as payment of taxes withheld on the vesting of restricted stock and/or restricted stock units.
[3] Based on the $135 million share repurchase authorization.
[4] Purchased as part of the repurchase program announced in October 2022.