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Commitments Contingencies and Other Matters - Additional Information (Detail) (USD $)
 1 Months Ended 12 Months Ended
Oct. 31, 2014
Dec. 31, 2014
Commitments and Contingencies Disclosure [Line Items]    
Letters of credit, collateral for retrospective premiums and retained losses   $ 39,800,000us-gaap_LettersOfCreditOutstandingAmount
Amount drawn under letters of credit   0pten_AmountDrawnFromLetterOfCredit
Commitments to purchase major equipment   512,000,000us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted
Current obligation   71,800,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount
Purchase obligations for 2015   15,400,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary
Civil penalties for alleged RCRA violations 1,100,000pten_CivilPenaltiesForAllegedFederalResourceConservationAndRecoveryViolations  
Self-insured retention   2,000,000us-gaap_SelfInsuranceReserve
Workers' compensation, deductible per occurrence   1,500,000pten_CoverageLimitForWorkersCompensation
Automobile liability insurance, deductible per occurrence   2,000,000pten_CoverageLimitForLiabilityInsurance
Key Employees | Change in Control Agreements    
Commitments and Contingencies Disclosure [Line Items]    
Automatic renewal period   12 months
New term notification period   90 days
Chairman of the Board and Chief Executive Officer | Change in Control Agreements    
Commitments and Contingencies Disclosure [Line Items]    
Employee entitlement ratio   2.5pten_EmployeeEntitlementRatioOnSumOfHighestSalaryAndAverageBonus
/ us-gaap_OtherCommitmentsAxis
= pten_ChangeInControlAgreementMember
/ us-gaap_TitleOfIndividualAxis
= pten_BoardOfDirectorsChairmanAndChiefExecutiveOfficerMember
Continued coverage entitlement of welfare plan period   3 years
Senior Vice Presidents | Change in Control Agreements    
Commitments and Contingencies Disclosure [Line Items]    
Employee entitlement ratio   2pten_EmployeeEntitlementRatioOnSumOfHighestSalaryAndAverageBonus
/ us-gaap_OtherCommitmentsAxis
= pten_ChangeInControlAgreementMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_VicePresidentMember
Continued coverage entitlement of welfare plan period   2 years
General Counsel | Change in Control Agreements    
Commitments and Contingencies Disclosure [Line Items]    
Employee entitlement ratio   1.5pten_EmployeeEntitlementRatioOnSumOfHighestSalaryAndAverageBonus
/ us-gaap_OtherCommitmentsAxis
= pten_ChangeInControlAgreementMember
/ us-gaap_TitleOfIndividualAxis
= pten_GeneralCounselMember
Continued coverage entitlement of welfare plan period   2 years
Non Revolving Senior Secured Term Loan    
Commitments and Contingencies Disclosure [Line Items]    
Advance to non-affiliates   12,000,000pten_AdvancesToNonAffiliates
/ us-gaap_DebtInstrumentAxis
= pten_NonRevolvingSeniorSecuredTermLoanMember
Notes receivable interest rate   5.00%pten_NotesReceivableInterestRate
/ us-gaap_DebtInstrumentAxis
= pten_NonRevolvingSeniorSecuredTermLoanMember
Notes receivable   11,800,000us-gaap_NotesAndLoansReceivableGrossNoncurrent
/ us-gaap_DebtInstrumentAxis
= pten_NonRevolvingSeniorSecuredTermLoanMember
Repayment of notes receivable   8,600,000us-gaap_ProceedsFromCollectionOfNotesReceivable
/ us-gaap_DebtInstrumentAxis
= pten_NonRevolvingSeniorSecuredTermLoanMember
Notes receivable outstanding   $ 3,200,000pten_NotesAndLoansReceivableOutstanding
/ us-gaap_DebtInstrumentAxis
= pten_NonRevolvingSeniorSecuredTermLoanMember