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Estimated Fair Value of Outstanding Debt Balances (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying value of Debt	$ 985,500us-gaap_LongTermDebt	$ 692,500us-gaap_LongTermDebt
Fair value of Debt	943,019us-gaap_DebtInstrumentFairValue	683,565us-gaap_DebtInstrumentFairValue
Revolving Credit Facility
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying value of Debt	303,000us-gaap_LongTermDebt / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember
Fair value of Debt	303,000us-gaap_DebtInstrumentFairValue / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember
Term Loan Facility
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying value of Debt	82,500us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = pten_TermLoanFacilityMember	92,500us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = pten_TermLoanFacilityMember
Fair value of Debt	82,500us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = pten_TermLoanFacilityMember	92,500us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = pten_TermLoanFacilityMember
4.97% Series A Senior Notes, Due October 5th 2020
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying value of Debt	300,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = pten_SeriesASeniorNotesFourPointNineSevenPercentDueOctoberFiveTwentyTwentyMember	300,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = pten_SeriesASeniorNotesFourPointNineSevenPercentDueOctoberFiveTwentyTwentyMember
Fair value of Debt	288,346us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = pten_SeriesASeniorNotesFourPointNineSevenPercentDueOctoberFiveTwentyTwentyMember	304,293us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = pten_SeriesASeniorNotesFourPointNineSevenPercentDueOctoberFiveTwentyTwentyMember
4.27% Series B Senior Notes, Due June 14th 2022
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying value of Debt	300,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = pten_SeriesBSeniorNotesFourPointTwoSevenPercentDueJuneFourteenTwentyTwentyTwoMember	300,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = pten_SeriesBSeniorNotesFourPointTwoSevenPercentDueJuneFourteenTwentyTwentyTwoMember
Fair value of Debt	$ 269,173us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = pten_SeriesBSeniorNotesFourPointTwoSevenPercentDueJuneFourteenTwentyTwentyTwoMember	$ 286,772us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = pten_SeriesBSeniorNotesFourPointTwoSevenPercentDueJuneFourteenTwentyTwentyTwoMember

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7



Reference 2: http://www.xbrl.org/2003/role/presentationRef

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