Closing price of common stock.

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Number of awards excluded from option-pricing model.

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Percentage of shares grant to participants.

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Share-based compensation arrangement by share-based payment award equity instruments other than options actual share payout percent.

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Share based payment award equity instruments other than options performance shares payout.

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Share based compensation arrangement by share based payment award equity instruments other than options performance shares payout range maximum.

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Share based compensation arrangement by share based payment award equity instruments other than options performance shares payout range minimum.

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Share-based compensation arrangement by share-based payment award equity instruments other than options purchase price of common stock percent.

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Share-based compensation arrangement by share-based payment award period.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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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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Date the equity-based award expires, in CCYY-MM-DD format.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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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.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Net number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Percentage of vesting of award under share-based payment arrangement.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Purchase price of common stock expressed as a percentage of its fair value.

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No definition available.

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Stock-Based Compensation Plans - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended				12 Months Ended
	Jan. 31, 2019	Nov. 30, 2018	Apr. 30, 2017	Jan. 31, 2016	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares available for grant under the stock incentive plans					93,946
Weighted-average fair value option granted					$ 58.37	$ 56.11	$ 40.08
Number of awards excluded from option-pricing model					2
Grant date fair value					$ 33,639
Fair value assumptions, Dividend yield rate					0.80%	0.80%	0.80%
Closing price of common stock					$ 379.11
Unrecognized compensation costs related to non-vested					$ 7,800
Weighted-average period over which cost is expected to be recognized					2 years 7 months 6 days
Pay-out ranges, Minimum					0.00%
Pay-out ranges, Maximum					150.00%
Incentive Stock Options [Member] \| President and Chief Operating Officer [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of stock option equity instruments granted during the period	76,868
Grant date fair value	$ 2,900
Share-based compensation arrangement by share-based payment award award vesting date	Jan. 22, 2024
Fair value assumptions, Risk free interest rate	2.60%
Fair value assumptions, Volatility rate	25.80%
Fair value assumptions, Dividend yield rate	0.80%
Share-based compensation arrangement by share-based payment award, options expiry date	Jul. 22, 2024
Incentive Stock Options [Member] \| President and Chief Operating Officer [Member] \| Range One [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-average fair value option granted	$ 272.88
Number of stock option equity instruments granted during the period	35,679
Percentage of fair market value of the common stock on the grant date	125.00%
Incentive Stock Options [Member] \| President and Chief Operating Officer [Member] \| Range Two [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-average fair value option granted	$ 294.71
Number of stock option equity instruments granted during the period	41,189
Percentage of fair market value of the common stock on the grant date	135.00%
Incentive Stock Options [Member] \| Chief Executive Officer [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of stock option equity instruments granted during the period		148,524
Grant date fair value		$ 5,500
Share-based compensation arrangement by share-based payment award award vesting date		Nov. 08, 2023
Fair value assumptions, Risk free interest rate		3.10%
Fair value assumptions, Volatility rate		25.90%
Fair value assumptions, Dividend yield rate		0.80%
Share-based compensation arrangement by share-based payment award, options expiry date		May 08, 2024
Incentive Stock Options [Member] \| Chief Executive Officer [Member] \| Range One [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-average fair value option granted		$ 257.78
Number of stock option equity instruments granted during the period		69,113
Percentage of fair market value of the common stock on the grant date		125.00%
Incentive Stock Options [Member] \| Chief Executive Officer [Member] \| Range Two [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-average fair value option granted		$ 278.40
Number of stock option equity instruments granted during the period		79,411
Percentage of fair market value of the common stock on the grant date		135.00%
Restricted Stock and Performance Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation costs related to non-vested					$ 31,000
Weighted-average period over which cost is expected to be recognized					1 year 7 months 6 days
Performance Based Share [Member] \| Chief Executive Officer [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grant date fair value		$ 5,500
Share-based compensation arrangement by share-based payment award award vesting date		Nov. 08, 2023
Fair value assumptions, Risk free interest rate		3.10%
Fair value assumptions, Volatility rate		26.10%
Fair value assumptions, Dividend yield rate		0.80%
Number of non-option equity instruments granted during the period		37,742
Performance period		5 years
Performance Based Share [Member] \| Chief Executive Officer [Member] \| Range One [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of non-option equity instruments granted during the period		17,942
Fair value per share on the grant date		$ 257.78
Percentage of fair market value of the common stock on the grant date		125.00%
Performance Based Share [Member] \| Chief Executive Officer [Member] \| Range Two [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of non-option equity instruments granted during the period		19,800
Fair value per share on the grant date		$ 278.40
Percentage of fair market value of the common stock on the grant date		135.00%
Performance Based Share [Member] \| Chief Operating Officer [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grant date fair value	$ 2,900
Share-based compensation arrangement by share-based payment award award vesting date	Jan. 22, 2024
Fair value assumptions, Risk free interest rate	2.60%
Fair value assumptions, Volatility rate	25.90%
Fair value assumptions, Dividend yield rate	0.80%
Number of non-option equity instruments granted during the period	18,914
Performance period	5 years
Performance Based Share [Member] \| Chief Operating Officer [Member] \| Range One [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of non-option equity instruments granted during the period	8,969
Fair value per share on the grant date	$ 272.88
Percentage of fair market value of the common stock on the grant date	125.00%
Performance Based Share [Member] \| Chief Operating Officer [Member] \| Range Two [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of non-option equity instruments granted during the period	9,945
Fair value per share on the grant date	$ 294.71
Percentage of fair market value of the common stock on the grant date	135.00%
Performance Based Share [Member] \| Officers and Senior Managers [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options Expiration Period			2 years	4 years
Pay-out ranges, Minimum			0.00%	0.00%
Pay-out ranges, Maximum			150.00%	150.00%
Number of non-option equity instruments granted during the period			9,367	33,509
Fair value per share on the grant date			$ 186.74	$ 103.30
Share-based compensation arrangement by share-based payment award, actual share payout percent			38.80%	106.50%
Share-based compensation arrangement by share-based payment award, actual share payout share			3,634	35,680
Performance Based Share [Member] \| Officers and Senior Managers [Member] \| Share-based Compensation Award, Tranche One [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award award vesting date			Apr. 01, 2020	Jan. 31, 2020
Share-based compensation arrangement by share-based payment award, award vesting rights			50.00%	50.00%
Performance Based Share [Member] \| Officers and Senior Managers [Member] \| Share-based Compensation Award, Tranche Two [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award award vesting date			Apr. 01, 2021	Jan. 31, 2021
Share-based compensation arrangement by share-based payment award, award vesting rights			50.00%	50.00%
Employees Stock Purchase Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Period vested for option grants					1 year
Number of non-option equity instruments granted during the period					617	989	1,034
Percentage of shares grant to participants					20.00%
Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Period vested for option grants					3 years
Options Expiration Period					6 years
Minimum [Member] \| Restricted Stock and Performance Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Period vested for option grants					3 years
Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Period vested for option grants					5 years
Options Expiration Period					10 years
Maximum [Member] \| Restricted Stock and Performance Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Period vested for option grants					5 years