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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
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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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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