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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.

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