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Company's Share-Based Compensation Plans (Detail) - shares
Dec. 31, 2019
Jun. 06, 2019
Jun. 29, 2017
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