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Stock-Based Compensation - Additional Information (Detail) |  | 3 Months Ended
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Feb. 15, 2022 Installment $ / shares shares | Mar. 31, 2022 USD ($) shares | Mar. 31, 2021 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock options granted | 1,492,020 |  |
Stock options fair value | $ / shares | $ 6.28 |  |
Stock options exercise price | $ / shares | $ 16.73 |  |
Restricted Stock and Restricted Stock Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares granted | 2,877,894 |  |
Restricted stock granted fair value | $ / shares | $ 16.73 |  |
Number of equal annual vesting installments | Installment | 3 |  |
Duration of performance-based restricted stock awards, vested |  | The restricted stock units vest in three equal annual installments commencing on the first anniversary of the grant date. |
Performance-base restricted stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Description of performance goal |  | The 2022 PSAs can be earned based on performance against two established goals over a three-year period: |
Performance-base restricted stock [Member] | Senior Management Employees [Member] | Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares granted | 0 |  |
Performance-base restricted stock [Member] | Senior Management Employees [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares granted | 1,188,884 |  |
Stock Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
TSR [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of Performance Shares Awarded |  | 85.00% |
NVA [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of Performance Shares Awarded |  | 15.00% |
TSR Award [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Description of performance goal |  | 85% with a TSR (total shareholder return) goal and 15% with an internal NVA (“NOV Value Added”, a return on capital metric) goal. |
2018 Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Authorized shares under stock based compensation |  | 42,700,000 |
Remaining shares available for future grants under the Plan |  | 4,100,000 |
Stock-based compensation expense | $ |  | $ 16,000,000 | $ 20,000,000
Income tax benefit recognized | $ |  | $ 0 | $ 0

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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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