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Business Segments - Revenues (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |
Total operating revenues | $ 3,182,291 us-gaap_SalesRevenueNet |  | $ 2,716,034 us-gaap_SalesRevenueNet |  | $ 2,723,414 us-gaap_SalesRevenueNet |
Operating Segments |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |
Total operating revenues | 3,188,472 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember |  | 2,721,301 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember |  | 2,728,220 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember |
Operating Segments | Contract Drilling |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |
Total operating revenues | 1,843,707 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = pten_ContractDrillingMember |  | 1,684,878 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = pten_ContractDrillingMember |  | 1,826,519 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = pten_ContractDrillingMember |
Operating Segments | Pressure Pumping |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |
Total operating revenues | 1,294,569 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = pten_PressurePumpingMember |  | 979,166 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = pten_PressurePumpingMember |  | 841,771 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = pten_PressurePumpingMember |
Operating Segments | Oil And Natural Gas |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |
Total operating revenues | 50,196 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = pten_OilAndNaturalGasMember |  | 57,257 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = pten_OilAndNaturalGasMember |  | 59,930 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = pten_OilAndNaturalGasMember |
Intersegment Elimination |  |  |  |  |  |
Segment Reporting Revenue Reconciling Item [Line Items] |  |  |  |  |  |
Total operating revenues | $ (6,181)us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | [1] | $ (5,267)us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | [1] | $ (4,806)us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | [1]
[1] | Consists of contract drilling and, in 2014, pressure pumping intercompany revenues for services provided to the oil and natural gas exploration and production segment.

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + 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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