SHARE-BASED COMPENSATION - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award
Number of shares available for grant (in shares)	2,500,000
Shares reserved for future issuance (in shares)	22,900,000
Weighted average grant date value (in dollars per share)	$ 231.93	$ 188.48
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award
Number of shares available for grant (in shares)	664,000
Shares reserved for future issuance (in shares)	2,000,000.0
Percentage of annual compensation participants may contribute	15.00%
Purchase price as a percentage of closing price on the last day of the quarter for ESPP transactions	85.00%
Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award
Contractual term (in years)	10 years
Unvested options to purchase (in shares)	752,000	1,200,000
Total unrecognized compensation cost	$ 164.0
Weighted average amortization period	3 years 1 month 13 days
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award
Share conversion rate (shares)	1
Minimum
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period (in years)	3 years
Minimum \| Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period (in years)	3 years
Minimum \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period (in years)	3 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period (in years)	6 years
Maximum \| Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period (in years)	6 years
Maximum \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period (in years)	5 years

Share based compensation arrangement by share based payment award options nonvested weighted average exercise price.

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- Definition

Share-based Compensation, Share Conversion Rate, Shares

+ References

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- Definition

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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section 50
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Amount of cost to be recognized for option under share-based payment arrangement.

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- Definition

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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- 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.

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- Definition

The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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- Definition

Number of shares authorized for issuance under share-based payment arrangement.

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- Definition

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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- Definition

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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- Definition

Number of non-vested options outstanding.

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- Definition

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

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