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Goodwill and Intangible Assets - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 1 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Oct. 31, 2010
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |
Accumulated impairment losses | $ 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss | $ 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss |  |
Goodwill impairment, long-term growth rate |  | 3.00%us-gaap_FairValueInputsLongTermRevenueGrowthRate |  |
Amortization expense | 3,643 us-gaap_AmortizationOfIntangibleAssets | 3,993 us-gaap_AmortizationOfIntangibleAssets | 4,110 us-gaap_AmortizationOfIntangibleAssets |
Non-compete Agreement |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |
Contract term |  |  |  | 3 years
Amortization period (in years) |  | 3 years |  |
Amortization expense |  | 350 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember | 467 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember |
Customer Relationships |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |
Amortization period (in years) | 7 years |  |  |
Amortization expense | $ 3,600 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | $ 3,600 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | $ 3,600 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Contract Drilling |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |
Goodwill impairment, discount rate |  | 11.87%us-gaap_FairValueInputsDiscountForLackOfMarketability / us-gaap_StatementBusinessSegmentsAxis = pten_ContractDrillingMember |  |
Pressure Pumping |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |
Goodwill impairment, discount rate |  | 12.40%us-gaap_FairValueInputsDiscountForLackOfMarketability / us-gaap_StatementBusinessSegmentsAxis = pten_PressurePumpingMember |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Adjustment to the discount rate used to measure fair value for lack of ability to convert business interests into cash quickly. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Percentage of assumed long-term growth in revenues, used as an input to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of accumulated impairment loss for 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 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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