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Business Segments - Assets (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |  |  |
Assets | $ 5,394,011 us-gaap_Assets |  | $ 4,687,127 us-gaap_Assets |  | $ 4,556,911 us-gaap_Assets |
Operating Segments | Contract Drilling |  |  |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |  |  |
Assets | 4,000,576 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = pten_ContractDrillingMember |  | 3,569,588 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = pten_ContractDrillingMember |  | 3,538,289 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = pten_ContractDrillingMember |
Operating Segments | Pressure Pumping |  |  |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |  |  |
Assets | 1,186,010 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = pten_PressurePumpingMember |  | 761,199 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = pten_PressurePumpingMember |  | 784,128 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = pten_PressurePumpingMember |
Operating Segments | Oil And Natural Gas |  |  |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |  |  |
Assets | 50,945 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = pten_OilAndNaturalGasMember |  | 58,656 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = pten_OilAndNaturalGasMember |  | 54,188 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = pten_OilAndNaturalGasMember |
Corporate and other |  |  |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |  |  |
Assets | $ 156,480 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | [1] | $ 297,684 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | [1] | $ 180,306 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | [1]
[1] | Corporate and other assets primarily include cash on hand, income tax receivables and certain deferred tax assets.

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + 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 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -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 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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