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Information with Respect to Class A Common Shares that were Surrendered or Repurchased (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Equity, Class of Treasury Stock [Line Items]        
Total Number of Shares Purchased 396      
Average Price Paid Per Share $ 24.95      
Total Number of Shares Purchased as Part of Publicly Announced Plan or Program 0      
Class A Common Shares        
Equity, Class of Treasury Stock [Line Items]        
Total Number of Shares Purchased   0 5,120 27,028
Average Price Paid Per Share     $ 29.74 $ 35.07
Total Number of Shares Purchased as Part of Publicly Announced Plan or Program     0 0
August 1-31, 2020 | Class A Common Shares        
Equity, Class of Treasury Stock [Line Items]        
Total Number of Shares Purchased [1] 396 [2]   396  
Average Price Paid Per Share [1] $ 24.95   $ 24.95  
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   $ 0  
January 1-31, 2020 | Class A Common Shares        
Equity, Class of Treasury Stock [Line Items]        
Total Number of Shares Purchased [1],[2]     3,124  
Average Price Paid Per Share [1]     $ 29.63  
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   $ 0  
February 1-29, 2020 | Class A Common Shares        
Equity, Class of Treasury Stock [Line Items]        
Total Number of Shares Purchased [1],[2]     1,600  
Average Price Paid Per Share [1]     $ 31.13  
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   $ 0  
January 1-31, 2019 | Class A Common Shares        
Equity, Class of Treasury Stock [Line Items]        
Total Number of Shares Purchased [1],[2]       7,945
Average Price Paid Per Share [1]       $ 36.23
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   $ 0
February 1-28, 2019 | Class A Common Shares        
Equity, Class of Treasury Stock [Line Items]        
Total Number of Shares Purchased [1],[2]       19,083
Average Price Paid Per Share [1]       $ 34.59
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   $ 0
[1] Based on settlement date.
[2] Surrendered by employees as payment of taxes withheld on the vesting of restricted stock.