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Related Party Transactions - Additional Information (Detail) - $ / shares | Jun. 15, 2021 | Jun. 09, 2021 | Mar. 15, 2021 | Mar. 10, 2021 | Feb. 03, 2021 | Jan. 04, 2021
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Retired Officer [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Purchase of shares |  |  |  |  |  | 1,160
Shares price per share |  |  |  |  |  | $ 66.01
Number of trading days to be considered for average price of stock repurchased |  |  |  |  |  | 30 days
Current Officers and Retired Officer [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Purchase of shares |  |  |  |  | 29,676 |
Shares price per share |  |  |  |  | $ 69.19 |
Number of trading days to be considered for average price of stock repurchased |  |  |  |  | 30 days |
Officer [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Purchase of shares | 10,000 |  |  | 19,497 |  |
Shares price per share | $ 75.87 |  |  | $ 71.10 |  |
Number of trading days to be considered for average price of stock repurchased | 30 days |  |  | 30 days |  |
Employee [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Purchase of shares |  | 1,500 | 2,257 |  |  |
Shares price per share |  | $ 74.09 | $ 71.91 |  |  |
Number of trading days to be considered for average price of stock repurchased |  | 30 days | 30 days |  |  |

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