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Company's Share-Based Compensation Plans (Detail) - shares | Dec. 31, 2019 | Jun. 06, 2019 | Jun. 29, 2017
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Amended and Restated Plan |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Shares Authorized for Grant | 28,400,000 | 28,400,000 |
Shares Underlying Awards Outstanding | 6,320,440 |  |
Shares Available for Grant | 8,331,502 | 9,500,000 | 9,800,000
Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan, as amended |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Shares Underlying Awards Outstanding | 2,533,500 |  |

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- Definition Share Based Compensation Arrangement By Share Based Payment Award Number of Shares Outstanding + References No definition available. + Details
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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. + References No definition available. + Details
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- Definition Number of shares authorized for issuance 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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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. + 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 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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