Summary of Stock Options Outstanding and Exercisable (Detail)	12 Months Ended
Dec. 31, 2021 $ / shares shares
$47.52
Share Based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized under stock option plans, exercise price range	$ 47.52
Number outstanding \| shares	4,435
Remaining contract life in years, Outstanding options	1 month 20 days
Number outstanding, Weighted average exercise price	$ 47.52
$49.07
Share Based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized under stock option plans, exercise price range	$ 49.07
Number outstanding \| shares	8,113
Remaining contract life in years, Outstanding options	1 year 1 month 20 days
Number outstanding, Weighted average exercise price	$ 49.07
$51.74
Share Based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized under stock option plans, exercise price range	$ 67.29
Number outstanding \| shares	13,961
Remaining contract life in years, Outstanding options	2 years 1 month 20 days
Number outstanding, Weighted average exercise price	$ 67.29
$67.29
Share Based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized under stock option plans, exercise price range	$ 80.40
Number outstanding \| shares	23,366
Remaining contract life in years, Outstanding options	3 years 1 month 17 days
Number outstanding, Weighted average exercise price	$ 80.40
$80.40
Share Based Compensation Arrangement by Share-based Payment Award [Line Items]
Number outstanding \| shares	49,875
Remaining contract life in years, Outstanding options	2 years 3 months 3 days
Number outstanding, Weighted average exercise price	$ 68.71

Share based compensation shares authorized under stock option plans exercise price.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ References

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- Definition

Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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