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Share-Based Compensation - Additional Information (Detail) - $ / shares shares in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Restricted Stock Units (RSUs) |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Share-based compensation arrangement by share- based payment award equity instruments other than options grants in period |  |  | 307 | 511
Share-based compensation arrangement by share-based payment award, equity Instruments other than options, grants in period. Weighted average fair value |  |  | $ 113.82 | $ 74.21
Share-based compensation arrangement by share-based payment award, award vesting period |  |  | 3 years | 3 years
Share-based compensation arrangement by share-based payment award, award vesting percentage |  |  | 100.00% | 100.00%
Restricted Stock Units (RSUs) | Non-Employee Directors |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Share-based compensation arrangement by share- based payment award equity instruments other than options grants in period |  |  | 13 | 19
Performance Stock Units (PSUs) |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Share-based compensation arrangement by share- based payment award equity instruments other than options grants in period |  |  | 75 | 95
Share-based compensation arrangement by share-based payment award, award vesting percentage |  |  | 100.00% | 100.00%
Maximum adjustment factor |  |  | 200.00% | 200.00%
Minimum adjustment factor |  |  | 50.00% | 50.00%
Minimum shares issued |  |  | 0 | 0
Employee Stock Purchase Plan |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Stock issued during period, shares, employee stock purchase plans | 698 | 677 | 698 | 677
Fair value of the employee stock purchase rights granted |  |  | $ 28.55 | $ 23.26

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- Definition Minimum adjustment factor allowed under the form of performance share award agreement. + References No definition available. + 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 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 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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