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SHARE-BASED COMPENSATION - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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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 |

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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. + 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of cost to be recognized for option under share-based payment arrangement. + 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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. + 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 (a)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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