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Stock-based Compensation - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 06, 2019 | Apr. 30, 2019 | Apr. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 29, 2017 | Apr. 17, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of stock option granted |  |  |  | 0 | 0 | 0 |  |
Employee Stock Option |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Options outstanding, aggregate intrinsic value |  |  |  | $ 0 |  |  |  |
Options outstanding, weighted-average remaining contractual term |  |  |  | 3 years 7 months 13 days |  |  |  |
Options exercisable, aggregate intrinsic value |  |  |  | $ 0 |  |  |  |
Options exercisable, weighted-average remaining contractual term |  |  |  | 3 years 7 months 6 days |  |  |  |
Outstanding non-vested options |  |  |  | 30,000 |  |  |  |
Restricted Stock Awards |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Outstanding non-vested restricted stock |  |  |  | 72,000 |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Outstanding non-vested restricted stock |  |  |  | 2,900,000 |  |  |  |
Performance Units Awards |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Performance period |  |  |  | 3 years |  |  |  |
Performance Units Awards | 2016 |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares issued |  | 185,000 |  |  |  |  |  |
Performance Units Awards | 2015 |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares issued |  |  | 381,200 |  |  |  |  |
Performance Units Awards | Condition One [Member] |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award description |  |  |  | For the Performance Units granted in May 2017 and April 2018, the recipients will receive a target number of shares if the Company’s total shareholder return during the performance period, when compared to the peer group, is at the 50th percentile. For the Performance Units granted in April 2019, the recipients will receive the target number of shares if the Company’s total shareholder return during the performance period, when compared to the peer group, is at the 55th percentile. If the Company’s total shareholder return during the performance period, when compared to the peer group, is at the 75th percentile or higher, then the recipients will receive two times the target number of shares. |  |  |  |
Patterson-UTI Energy, Inc. 2014 Long-Term Incentive Plan |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares authorized for grant |  |  |  |  |  |  |  | 9,100,000
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 available for future issuance | 9,500,000 |  |  | 8,331,502 |  |  | 9,800,000 |
Extended date for awards granted | Jun. 06, 2029 |  |  |  |  |  |  |
Amended and Restated Plan | Maximum |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Option term |  |  |  | 10 years |  |  |  |
Amended and Restated Plan | Non Employee Director |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Awards vesting period |  |  |  | 1 year |  |  |  |
Amended and Restated Plan | Employees |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Awards vesting period |  |  |  | 3 years |  |  |  |
Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan | Non Employee Director | Employee Stock Option |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Awards vesting period |  |  |  | 1 year |  |  |  |
Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan | Employees | Employee Stock Option |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Awards vesting period |  |  |  | 3 years |  |  |  |

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