Capital Stock and Equity Compensation (Time Based Restricted Stock Awards) (Detail) - Time Based Restricted Stock - $ / shares	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Awards Outstanding
Awards outstanding, beginning balance (in shares)	102,142	101,685	117,476
Awards granted (in shares)	50,640	58,807	62,115
Stock issued (in shares)	(46,329)	(50,868)	(68,111)
Awards forfeited (in shares)	(9,464)	(7,482)	(9,795)
Awards outstanding, ending balance (in shares)	96,989	102,142	101,685
Weighted- Average Grant Date Fair Value
Awards outstanding, beginning balance (in dollars per share)	$ 120.16	$ 122.68	$ 116.10
Awards granted (in dollars per share)	180.19	116.87	126.92
Stock issued (in dollars per share)	146.45	111.16	81.53
Awards forfeited (in dollars per share)	146.58	122.87	116.52
Awards outstanding, ending balance (in dollars per share)	$ 157.49	$ 120.16	$ 122.68

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ References

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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-Publisher FASB
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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

+ References

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-Publisher FASB
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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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