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Business Segments - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 Customer | Dec. 31, 2013 Customer | Dec. 31, 2011 Customer
Segment Reporting Disclosure [Line Items] |  |  |
Number of reportable business segments | 3 us-gaap_NumberOfReportableSegments |  |
Long-lived assets | 4,131,071,000 us-gaap_PropertyPlantAndEquipmentNet | $ 3,635,541,000 us-gaap_PropertyPlantAndEquipmentNet |
Major Customer |  |  |
Segment Reporting Disclosure [Line Items] |  |  |
Revenues |  | 286,000,000 us-gaap_Revenues / us-gaap_MajorCustomersAxis = pten_MajorCustomerMember |
Number of customers accounted for 10% or more of consolidated revenues | 0 pten_CustomersAccountingForTenPercentOrMoreOfNetRevenue / us-gaap_MajorCustomersAxis = pten_MajorCustomerMember | 1 pten_CustomersAccountingForTenPercentOrMoreOfNetRevenue / us-gaap_MajorCustomersAxis = pten_MajorCustomerMember | 0 pten_CustomersAccountingForTenPercentOrMoreOfNetRevenue / us-gaap_MajorCustomersAxis = pten_MajorCustomerMember
Major Customer | Revenues |  |  |
Segment Reporting Disclosure [Line Items] |  |  |
Percentage of sales revenues |  | 10.50%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueSegmentMember / us-gaap_MajorCustomersAxis = pten_MajorCustomerMember |
Contract Drilling |  |  |
Segment Reporting Disclosure [Line Items] |  |  |
Marketable land-based drilling rigs | 239 pten_NumberOfMarketableLandBasedRigs / pten_TypeOfOperationsAxis = pten_ContractDrillingMember |  |
Canada | Contract Drilling |  |  |
Segment Reporting Disclosure [Line Items] |  |  |
Oil and gas services | 87,500,000 us-gaap_RevenueOilAndGasServices / us-gaap_StatementGeographicalAxis = country_CA / pten_TypeOfOperationsAxis = pten_ContractDrillingMember | 86,600,000 us-gaap_RevenueOilAndGasServices / us-gaap_StatementGeographicalAxis = country_CA / pten_TypeOfOperationsAxis = pten_ContractDrillingMember | 79,400,000 us-gaap_RevenueOilAndGasServices / us-gaap_StatementGeographicalAxis = country_CA / pten_TypeOfOperationsAxis = pten_ContractDrillingMember
Long-lived assets | 57,600,000 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_CA / pten_TypeOfOperationsAxis = pten_ContractDrillingMember | $ 69,100,000 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_CA / pten_TypeOfOperationsAxis = pten_ContractDrillingMember |

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- Definition Customers Accounting For Ten Percent Or More Of Net Revenue + References No definition available. + Details
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- Definition Number of marketable land based rigs. + References No definition available. + Details
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 + Details
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- Definition Revenue from oil and gas-related services including well services (such as drilling, rigs and analytic evaluations), transportation, and other supporting contractor services, during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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