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Fair Value of Stock Settled Performance Units (Detail) (Performance Units Awards, USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014
2014 |
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award Performance Options [Line Items] |
Aggregate fair value at date of grant | $ 5,388 pten_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantDateFairValueOfAwards / us-gaap_AwardDateAxis = pten_YearTwentyFourteenMember / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember
2013 |
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award Performance Options [Line Items] |
Aggregate fair value at date of grant | 5,564 pten_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantDateFairValueOfAwards / us-gaap_AwardDateAxis = pten_YearTwentyThirteenMember / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember
2012 |
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award Performance Options [Line Items] |
Aggregate fair value at date of grant | 3,065 pten_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantDateFairValueOfAwards / us-gaap_AwardDateAxis = pten_YearTwentyTwelveMember / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember
2011 |
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award Performance Options [Line Items] |
Aggregate fair value at date of grant | 5,569 pten_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantDateFairValueOfAwards / us-gaap_AwardDateAxis = pten_YearTwentyElevenMember / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember
2010 |
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award Performance Options [Line Items] |
Aggregate fair value at date of grant | $ 3,117 pten_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantDateFairValueOfAwards / us-gaap_AwardDateAxis = pten_YearTwentyTenMember / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember

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- Definition Share Based Compensation Arrangement By Share Based Payment Award Grant Date Fair Value Of Awards + References No definition available. + Details
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