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Goodwill by Operating Segment (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2012 | Dec. 31, 2013
Goodwill [Line Items] |  |  |
Beginning Balance | $ 153,809 us-gaap_Goodwill | $ 153,809 us-gaap_Goodwill |
Changes to goodwill | 56,986 us-gaap_GoodwillPeriodIncreaseDecrease |  |
Ending Balance | 210,795 us-gaap_Goodwill | 153,809 us-gaap_Goodwill |
Contract Drilling |  |  |
Goodwill [Line Items] |  |  |
Beginning Balance |  | 86,234 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = pten_ContractDrillingMember | 86,234 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = pten_ContractDrillingMember
Ending Balance | 86,234 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = pten_ContractDrillingMember | 86,234 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = pten_ContractDrillingMember | 86,234 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = pten_ContractDrillingMember
Pressure Pumping |  |  |
Goodwill [Line Items] |  |  |
Beginning Balance | 67,575 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = pten_PressurePumpingMember | 67,575 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = pten_PressurePumpingMember |
Changes to goodwill | 56,986 us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = pten_PressurePumpingMember |  |
Ending Balance | $ 124,561 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = pten_PressurePumpingMember | $ 67,575 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = pten_PressurePumpingMember |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of increase (decrease) of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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