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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