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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 |  | $ 39,800,000 us-gaap_LettersOfCreditOutstandingAmount
Amount drawn under letters of credit |  | 0 pten_AmountDrawnFromLetterOfCredit
Commitments to purchase major equipment |  | 512,000,000 us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted
Current obligation |  | 71,800,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount
Purchase obligations for 2015 |  | 15,400,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary
Civil penalties for alleged RCRA violations | 1,100,000 pten_CivilPenaltiesForAllegedFederalResourceConservationAndRecoveryViolations |
Self-insured retention |  | 2,000,000 us-gaap_SelfInsuranceReserve
Workers' compensation, deductible per occurrence |  | 1,500,000 pten_CoverageLimitForWorkersCompensation
Automobile liability insurance, deductible per occurrence |  | 2,000,000 pten_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 |  | 2.5 pten_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 |  | 2 pten_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 |  | 1.5 pten_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 |  | 12,000,000 pten_AdvancesToNonAffiliates / us-gaap_DebtInstrumentAxis = pten_NonRevolvingSeniorSecuredTermLoanMember
Notes receivable interest rate |  | 5.00%pten_NotesReceivableInterestRate / us-gaap_DebtInstrumentAxis = pten_NonRevolvingSeniorSecuredTermLoanMember
Notes receivable |  | 11,800,000 us-gaap_NotesAndLoansReceivableGrossNoncurrent / us-gaap_DebtInstrumentAxis = pten_NonRevolvingSeniorSecuredTermLoanMember
Repayment of notes receivable |  | 8,600,000 us-gaap_ProceedsFromCollectionOfNotesReceivable / us-gaap_DebtInstrumentAxis = pten_NonRevolvingSeniorSecuredTermLoanMember
Notes receivable outstanding |  | $ 3,200,000 pten_NotesAndLoansReceivableOutstanding / us-gaap_DebtInstrumentAxis = pten_NonRevolvingSeniorSecuredTermLoanMember

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- Definition Advances to non affiliates. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Agreement extension period. + References No definition available. + Details
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Namespace Prefix: | pten_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Agreement new term notification period. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Amount drawn from letter of credit. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Civil penalties for alleged federal resource conservation and recovery violations. + References No definition available. + Details
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Namespace Prefix: | pten_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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- Definition Continued coverage entitlement of welfare plan period. + References No definition available. + Details
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Namespace Prefix: | pten_
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Balance Type: | na
Period Type: | duration

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- Definition Coverage limit for liability insurance. + References No definition available. + Details
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Namespace Prefix: | pten_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Annual Coverage Limit for Workers Compensation. + References No definition available. + Details
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Namespace Prefix: | pten_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Employee entitlement ratio on sum of highest salary and average bonus. + References No definition available. + Details
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Namespace Prefix: | pten_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

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- Definition Notes and loans receivable outstanding. + References No definition available. + Details
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Namespace Prefix: | pten_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Notes receivable interest rate. + References No definition available. + Details
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Namespace Prefix: | pten_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition An amount representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date(s) more than one year from the balance sheet date. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The cash inflow associated with principal collections from a borrowing supported by a written promise to pay an obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.25) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 25 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 17 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.17) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a)(19)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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Balance Type: | credit
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- Definition Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant

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- Definition Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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- Details
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- Details
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