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Information with Respect to Class A Common Shares that were Surrendered or Repurchased (Detail) - Class A Common Shares - USD ($)
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Equity, Class of Treasury Stock [Line Items]    
Shares repurchased [1] 253,302 4,781
Average Price Paid Per Share [1] $ 25.82 $ 25.13
Total Number of Shares Purchased as Part of Publicly Announced Plan or Program [1] 0 0
Approximate Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs [1] $ 0 [2] $ 0
January 1-31, 2023 | Employee    
Equity, Class of Treasury Stock [Line Items]    
Shares repurchased [1],[3] 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],[2] $ 0  
January 1-31, 2023 | $60 Million Share Repurchase Program    
Equity, Class of Treasury Stock [Line Items]    
Shares repurchased [1],[4] 250,000  
Average Price Paid Per Share [1] $ 25.90  
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],[2] $ 31,604,066  
January 1-31, 2022    
Equity, Class of Treasury Stock [Line Items]    
Shares repurchased [1],[3]   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
[1] Based on settlement date.
[2] Based on the $60 million share repurchase authorization.
[3] Surrendered by employees as payment of taxes withheld on the vesting of restricted stock and/or restricted stock units.
[4] Purchased as part of the repurchase program announced in October 2022.