XML 39 R52.htm IDEA: XBRL DOCUMENT v2.4.1.9

Property and Equipment - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Impairment charges related to oil and natural gas properties	$ 20.9us-gaap_ImpairmentOfOilAndGasProperties	$ 4.0us-gaap_ImpairmentOfOilAndGasProperties	$ 1.9us-gaap_ImpairmentOfOilAndGasProperties
Proceeds from sale of oil and natural gas properties			42.5us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment
Gain on sale of oil and natural gas properties			22.6us-gaap_GainLossOnSaleOfOilAndGasProperty
Drilling Rigs That Would No Longer Be Marketed As Rigs
Property, Plant and Equipment [Line Items]
Number of drilling rigs	55pten_NumberOfRigs / us-gaap_PropertyPlantAndEquipmentByTypeAxis = pten_DrillingRigsMember	48pten_NumberOfRigs / us-gaap_PropertyPlantAndEquipmentByTypeAxis = pten_DrillingRigsMember	36pten_NumberOfRigs / us-gaap_PropertyPlantAndEquipmentByTypeAxis = pten_DrillingRigsMember
Impairment charges of fleets	77.9us-gaap_TangibleAssetImpairmentCharges / us-gaap_PropertyPlantAndEquipmentByTypeAxis = pten_DrillingRigsMember	37.8us-gaap_TangibleAssetImpairmentCharges / us-gaap_PropertyPlantAndEquipmentByTypeAxis = pten_DrillingRigsMember	5.2us-gaap_TangibleAssetImpairmentCharges / us-gaap_PropertyPlantAndEquipmentByTypeAxis = pten_DrillingRigsMember
Mechanically powered drilling rigs
Property, Plant and Equipment [Line Items]
Number of drilling rigs		55pten_NumberOfRigs / us-gaap_PropertyPlantAndEquipmentByTypeAxis = pten_MechanicalRigsMember
Impairment charges of fleets		29.9us-gaap_TangibleAssetImpairmentCharges / us-gaap_PropertyPlantAndEquipmentByTypeAxis = pten_MechanicalRigsMember
Pressure Pumping
Property, Plant and Equipment [Line Items]
Impairment charges of fleets			$ 7.3us-gaap_TangibleAssetImpairmentCharges / us-gaap_PropertyPlantAndEquipmentByTypeAxis = pten_PressurePumpingMember
Number of horsepower of pressure pumping equipment that would no longer be marketed			37,000pten_NumberOfHorsepower / us-gaap_PropertyPlantAndEquipmentByTypeAxis = pten_PressurePumpingMember

X

- Definition

Number of horsepower.

+ References

No definition available.

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- Definition

Number of rigs.

+ References

No definition available.

+ Details

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X

- Definition

Amount of gain (loss) on sale or disposal of proven and unproven oil and gas properties.

+ 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

+ Details

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X

- Definition

The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced.

+ 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 932

-SubTopic 360

-Section 35

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=28370743&loc=d3e66150-109466



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230

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- Definition

The cash inflow to dispose of long-lived, physical assets and mineral interests in oil and gas properties used for normal oil and gas operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

The charge against earnings resulting from the aggregate write down of tangible assets from their carrying value to their fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230

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