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Commitments Contingencies and Other Matters - Additional Information (Detail) (USD $) | 1 Months Ended | 3 Months Ended
--- | --- | ---
Mar. 31, 2015 | Oct. 31, 2014 | Mar. 31, 2015
Commitments and Contingencies Disclosure [Line Items] |  |  |
Letters of credit, collateral for retrospective premiums and retained losses | $ 39,800,000 us-gaap_LettersOfCreditOutstandingAmount |  | $ 39,800,000 us-gaap_LettersOfCreditOutstandingAmount
Amount drawn under letters of credit |  |  | 0 pten_AmountDrawnFromLetterOfCredit
Commitments to purchase major equipment | 350,000,000 us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted |  | 350,000,000 us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted
Current obligation | 69,300,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount |  | 69,300,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount
Obligation for remainder of the year | 13,000,000 us-gaap_UnrecordedUnconditionalPurchaseObligationDueInRemainderOfFiscalYear |  | 13,000,000 us-gaap_UnrecordedUnconditionalPurchaseObligationDueInRemainderOfFiscalYear
Settlement of fund for eligible participants | 12,260,000 us-gaap_LitigationSettlementAmount |  |
Civil penalties for alleged RCRA violations |  | 1,100,000 pten_CivilPenaltiesForAllegedFederalResourceConservationAndRecoveryViolations |
Civil penalties to resolve RCRA violations | 500,000 pten_CivilPenaltiesToResolveAllegedFederalResourceConservationAndRecoveryViolations |  |
Advances to Vendor |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Advance to non-affiliates | 12,000,000 pten_AdvancesToNonAffiliates / us-gaap_FinancialInstrumentAxis = pten_AdvancesToVendorMember |  | 12,000,000 pten_AdvancesToNonAffiliates / us-gaap_FinancialInstrumentAxis = pten_AdvancesToVendorMember
Notes receivable interest rate | 5.00%pten_NotesReceivableInterestRate / us-gaap_FinancialInstrumentAxis = pten_AdvancesToVendorMember |  | 5.00%pten_NotesReceivableInterestRate / us-gaap_FinancialInstrumentAxis = pten_AdvancesToVendorMember
Notes receivable | 11,800,000 us-gaap_NotesAndLoansReceivableGrossNoncurrent / us-gaap_FinancialInstrumentAxis = pten_AdvancesToVendorMember |  | 11,800,000 us-gaap_NotesAndLoansReceivableGrossNoncurrent / us-gaap_FinancialInstrumentAxis = pten_AdvancesToVendorMember
Repayment of notes receivable |  |  | 9,700,000 us-gaap_ProceedsFromCollectionOfNotesReceivable / us-gaap_FinancialInstrumentAxis = pten_AdvancesToVendorMember
Notes receivable outstanding | $ 2,100,000 pten_NotesAndLoansReceivableOutstanding / us-gaap_FinancialInstrumentAxis = pten_AdvancesToVendorMember |  | $ 2,100,000 pten_NotesAndLoansReceivableOutstanding / us-gaap_FinancialInstrumentAxis = pten_AdvancesToVendorMember

X
- Definition Advances to non affiliates. + References No definition available. + Details
Name: | pten_AdvancesToNonAffiliates
Namespace Prefix: | pten_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount drawn from letter of credit. + References No definition available. + Details
Name: | pten_AmountDrawnFromLetterOfCredit
Namespace Prefix: | pten_
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
Name: | pten_CivilPenaltiesForAllegedFederalResourceConservationAndRecoveryViolations
Namespace Prefix: | pten_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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

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- Definition Notes and loans receivable outstanding. + References No definition available. + Details
Name: | pten_NotesAndLoansReceivableOutstanding
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
Name: | pten_NotesReceivableInterestRate
Namespace Prefix: | pten_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition Amount of judgment or settlement awarded to (against) the entity in respect of litigation. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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

X
- Definition Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the remainder of the 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 No definition available. + 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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Namespace Prefix: |
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Balance Type: |
Period Type: |