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Fair Value of Stock Settled Performance Units (Detail) (Performance Units Awards, USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015
2014 |
Share Based Compensation Arrangement By Share Based Payment Award [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 |
Share Based Compensation Arrangement By Share Based Payment Award [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 |
Share Based Compensation Arrangement By Share Based Payment Award [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 |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Aggregate fair value at date of grant | $ 5,569 pten_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantDateFairValueOfAwards / us-gaap_AwardDateAxis = pten_YearTwentyElevenMember / 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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Namespace Prefix: | pten_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration