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Stock-based Compensation - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Jun. 29, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Number of stock option granted | 0 |
Employee Stock Option |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Options outstanding, aggregate intrinsic value | $ 25.9 |
Options outstanding, weighted-average remaining contractual term | 4 years 7 months 24 days |
Options exercisable, aggregate intrinsic value | $ 23.7 |
Options exercisable, weighted-average remaining contractual term | 4 years 3 months 21 days |
Outstanding non-vested options | 521,182 |
Restricted Stock Awards |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Outstanding non-vested restricted stock | 1,500,000 |
Performance Units Awards |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Performance period | 3 years |
Basis of annual percentage exceeds | 18.00% |
Performance Units Awards | 2012 |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Total shareholder return percentile for performance period | 87.00% |
Shares issued | 384,000 |
Performance Units Awards | 2014 |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Total shareholder return percentile for performance period | 89.00% |
Performance Units Awards | Condition One [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Award description | Generally, 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. 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 |
Performance Units Awards | Condition Two [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Award description | if, during the two-year period ending March 31, 2018, the Company’s total shareholder return for any 30 consecutive day period equals or exceeds 18 percent on an annualized basis from April 1, 2013 through the last day of such 30 consecutive day period, and the recipient is actively employed by the Company through the last day of the extended performance period, then the Company will issue to the recipient the number of shares equal to the amount the recipient would have been entitled to receive had the Company’s total shareholder return been positive during the initial three-year performance period. |
Amended and Restated Plan |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Shares available for future issuance | 7,647,874 | 10,049,156
Shares authorized for grant | 18,900,000 | 18,900,000
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. 2014 Long-Term Incentive Plan |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Shares authorized for grant |  | 9,100,000
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 | Non Employee Director | Restricted Stock Awards |  |
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 |
Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan | Employees | Restricted Stock Awards |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Awards vesting period | 3 years |

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- Definition General descriptive information regarding an arrangement under which employees and directors receive: (a) awards of equity shares, equity share options, or other equity instruments; or (b) the entity incurs liabilities to them: (1) in amounts based, at least in part, on the price of the entity's shares or other equity instruments; or (2) that require or may require settlement by issuance of the entity's shares. Such an arrangement is usually provided to employees and directors to compensate them, provide performance incentives to them, and to attract or retain their services. May also include pertinent information particular to a plan that is not elsewhere specified in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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