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Stock-based Compensation - Additional Information (Detail) (USD $)
 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Employee Stock Option
Dec. 31, 2013
Restricted Stock Awards
Dec. 31, 2013
2009 Performance Units
Dec. 31, 2012
2009 Performance Units
Dec. 31, 2011
2009 Performance Units
Apr. 30, 2012
2009 Performance Units
Apr. 30, 2013
Performance Unit Awards 2010
Dec. 31, 2013
Performance Unit Awards 2010
Dec. 31, 2012
Performance Unit Awards 2010
Dec. 31, 2011
Performance Unit Awards 2010
Dec. 31, 2013
Acquired to satisfy the exercise price
Employee Stock Option
Dec. 31, 2013
Acquired to satisfy payroll tax withholding obligations
Employee Stock Option
Dec. 31, 2013
Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan, as amended
Maximum
Dec. 31, 2013
Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan, as amended
Non Employee Director
Dec. 31, 2013
Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan, as amended
Employees
Dec. 31, 2013
Patterson-UTI Energy, Inc. Amended and Restated 1997 Long-Term Incentive Plan, as amended ("1997 Plan")
Restricted Stock Awards
Dec. 31, 2013
Patterson-UTI Energy, Inc. Amended and Restated 1997 Long-Term Incentive Plan, as amended ("1997 Plan")
Maximum
Employee Stock Option
Dec. 31, 2013
Patterson-UTI Energy, Inc. Amended and Restated 1997 Long-Term Incentive Plan, as amended ("1997 Plan")
Minimum
Employee Stock Option
Compensation Related Costs Share Based Payments Disclosure [Line Items]                                          
Awards vesting period                                 1 year 3 years 4 years 5 years 3 years
Option term                               10 years       10 years  
Treasury stock shares acquired       637,624                                  
Treasury stock acquisition price $ 85,837,000 $ 170,292,000 $ 4,314,000                     $ 12,300,000 $ 2,900,000            
Options outstanding, aggregate intrinsic value 37,000,000                                        
Options outstanding, weighted-average remaining contractual term 5 years 1 month 6 days                                        
Options exercisable, aggregate intrinsic value 32,000,000                                        
Options exercisable, weighted-average remaining contractual term 4 years 5 months 12 days                                        
Outstanding non-vested options 1,100,000                                        
Outstanding non-vested restricted stock         1,400,000                                
Performance period           3 years                              
Award description           Generally, the recipients would receive a target payment if the Company's total shareholder return was positive and, when compared to the peer group, was at or above the 50thpercentile but less than the 75thpercentile and two times the target if at the 75thpercentile or higher.                              
Target awards payment           3,400,000                              
Pro-rated obligation                 1,700,000                        
Compensation expense             $ (1,900,000) $ 1,300,000     $ 260,000 $ 1,039,000 $ 1,039,000                
Shares issued                   357,500