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Share-Based Compensation - Summary of Nonvested Restricted Stock Activity and Related Information (Detail) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Restricted Shares
Shares
Non-vested restricted stock outstanding at the beginning of the year (in shares)	561
Nonvested restricted stock, Granted (in shares)	381
Nonvested restricted stock, Vested (in shares)	(201)
Nonvested restricted stock, Forfeited (in shares)	(40)
Non-vested restricted stock outstanding at the end of the year (in shares)	701	561
Weighted Average Grant Date Fair Value
Non-vested restricted stock outstanding at the beginning of the year, weighted average grant date fair value (in USD per share)	$ 72.46
Weighted average grant date fair value, Granted (in USD per share)	80.27	$ 85.81
Weighted average grant date fair value, Vested (in USD per share)	71.37
Weighted average grant date fair value, Forfeited (in USD per share)	75.12
Non-vested restricted stock outstanding at the end of the year, weighted average grant date fair value (in USD per share)	$ 76.86	$ 72.46
Performance Restricted Stock Units
Shares
Non-vested restricted stock outstanding at the beginning of the year (in shares)	148
Nonvested restricted stock, Granted (in shares)	119
Nonvested restricted stock, Vested (in shares)	0
Nonvested restricted stock, Forfeited (in shares)	(3)
Non-vested restricted stock outstanding at the end of the year (in shares)	264	148
Weighted Average Grant Date Fair Value
Non-vested restricted stock outstanding at the beginning of the year, weighted average grant date fair value (in USD per share)	$ 80.57
Weighted average grant date fair value, Granted (in USD per share)	63.37
Weighted average grant date fair value, Vested (in USD per share)	0
Weighted average grant date fair value, Forfeited (in USD per share)	73.35
Non-vested restricted stock outstanding at the end of the year, weighted average grant date fair value (in USD per share)	$ 72.90	$ 80.57

X

- Definition

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

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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.

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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).

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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).

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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.

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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.

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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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