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Treasury Stock Acquisition (Detail)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
USD ($)
shares
Schedule of Treasury Stock [Line Items]  
Treasury shares at beginning of period | shares 43,802,611
Treasury shares at end of period | shares 49,880,271
Treasury shares at beginning of period $ 918,711
Treasury stock acquired, cost 111,655
Treasury shares at end of period $ 1,030,366
Stock Buyback Program  
Schedule of Treasury Stock [Line Items]  
Treasury stock acquired, shares | shares 5,515,853
Treasury stock acquired, cost $ 100,500
Long Term Incentive Plan  
Schedule of Treasury Stock [Line Items]  
Treasury stock acquired, shares | shares 561,807 [1]
Treasury stock acquired, cost $ 11,155 [1]
[1] The Company withheld 561,807 shares in the nine months ended September 30, 2018 with respect to employees’ tax withholding obligations upon vesting of restricted shares. These shares were acquired at fair market value pursuant to the terms of the Patterson-UTI Energy, Inc. 2014 Long-Term Incentive Plan and not pursuant to the stock buyback program.