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Treasury Stock Acquisition (Detail) $ in Thousands | 6 Months Ended
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Jun. 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 | 46,865,608 |
Treasury shares at beginning of period | $ 918,711 |
Treasury stock acquired, cost | 59,879 |
Treasury shares at end of period | $ 978,590 |
Stock Buyback Program |  |
Schedule of Treasury Stock [Line Items] |  |
Treasury stock acquired, shares | shares | 2,603,317 |
Treasury stock acquired, cost | $ 50,530 |
Long Term Incentive Plan |  |
Schedule of Treasury Stock [Line Items] |  |
Treasury stock acquired, shares | shares | 459,680 | [1]
Treasury stock acquired, cost | $ 9,349 | [1]
[1] | The Company withheld 459,680 shares in the second quarter of 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.

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