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v3.22.1

Income Taxes - Additional Information (Detail) | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Income Tax Disclosure [Abstract] |  |
Effective tax rates | 9.10% | (5.50%)

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- Definition Effective tax rate continuing operations. + References No definition available. + Details
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Namespace Prefix: | dnow_
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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration