Related Party Transactions - Additional Information (Detail) - $ / shares	Mar. 15, 2021	Mar. 10, 2021	Feb. 03, 2021	Jan. 04, 2021
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		19,497
Shares price per share		$ 71.10
Number of trading days to be considered for average price of stock repurchased		30 days
Employee [Member]
Related Party Transaction [Line Items]
Purchase of shares	2,257
Shares price per share	$ 71.91
Number of trading days to be considered for average price of stock repurchased	30 days