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Stock Compensation Plans - RSU, PRS and Cash RSU Activity (Detail) shares in Thousands	12 Months Ended
	Dec. 31, 2020 $ / shares shares
RSU's [Member]
Number of Shares
Beginning balance (in shares) | shares	497
Granted (in shares) | shares	212
Vested (in shares) | shares	(161)
Forfeited (in shares) | shares	(23)
Ending balance (in shares) | shares	525
Weighted Average Grant Date Fair Value Per Share
Beginning balance (in dollars per share) | $ / shares	$ 130.24
Granted (in dollars per share) | $ / shares	121.55
Vested (in dollars per share) | $ / shares	130.99
Forfeited (in dollars per share) | $ / shares	128.29
Ending balance (in dollars per share) | $ / shares	$ 126.62
Restricted Stock [Member]
Number of Shares
Beginning balance (in shares) | shares	168
Granted (in shares) | shares	66
Vested (in shares) | shares	(41)
Forfeited (in shares) | shares	0
Ending balance (in shares) | shares	193
Weighted Average Grant Date Fair Value Per Share
Beginning balance (in dollars per share) | $ / shares	$ 138.96
Granted (in dollars per share) | $ / shares	131.31
Vested (in dollars per share) | $ / shares	138.83
Forfeited (in dollars per share) | $ / shares	0
Ending balance (in dollars per share) | $ / shares	$ 136.37
Cash RSU's [Member]
Number of Shares
Beginning balance (in shares) | shares	95
Granted (in shares) | shares	50
Vested (in shares) | shares	(30)
Forfeited (in shares) | shares	(4)
Ending balance (in shares) | shares	111
Weighted Average Grant Date Fair Value Per Share
Beginning balance (in dollars per share) | $ / shares	$ 126.35
Granted (in dollars per share) | $ / shares	108.84
Vested (in dollars per share) | $ / shares	131.93
Forfeited (in dollars per share) | $ / shares	120.15
Ending balance (in dollars per share) | $ / shares	$ 108.84

X

- Definition

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

+ 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)(iv)(3)
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- Definition

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.

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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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- Definition

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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- Definition

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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-Name Accounting Standards Codification
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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 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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