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Acquisitions - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2014 hp | Jun. 30, 2014 hp | Dec. 31, 2014
Business Acquisition [Line Items] |  |  |
Hydraulic fracturing equipment purchased in the acquisition | 148,250 pten_EquipmentPurchasedInAcquisition | 31,500 pten_EquipmentPurchasedInAcquisition |
Payments to acquire businesses |  |  | $ 176 us-gaap_PaymentsToAcquireBusinessesGross
Revenue from acquired business |  |  | 80.8 us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual
Operating income (loss) from acquired business |  |  | $ 13.7 us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsRevenuesAndGainsRecognized
Pressure Pumping |  |  |
Business Acquisition [Line Items] |  |  |
Number of pressure pumping acquisitions |  |  | 2 pten_NumberOfAcquisitions / us-gaap_PropertyPlantAndEquipmentByTypeAxis = pten_PressurePumpingMember

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- Definition Horsepower fracturing equipment purchased in the acquisition. + References No definition available. + Details
Name: | pten_EquipmentPurchasedInAcquisition
Namespace Prefix: | pten_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of acquisitions. + References No definition available. + Details
Name: | pten_NumberOfAcquisitions
Namespace Prefix: | pten_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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

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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The revenues and gains recognized recorded for each transaction with the acquiree that is recognized separately from the acquisition of assets and assumptions of liabilities in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + 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 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=pten_PressurePumpingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |