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Difference Between Statutory Federal Income Tax Rate and Effective Income Rate (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Statutory tax rate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State income taxes	2.50%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	3.70%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	2.50%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Permanent differences	(1.40%)pten_EffectiveIncomeTaxRateReconciliation	(1.50%)pten_EffectiveIncomeTaxRateReconciliation	(0.20%)pten_EffectiveIncomeTaxRateReconciliation
Other, net	(0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	(0.60%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	(0.30%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective tax rate	36.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations	36.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations	37.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations

X

- Definition

Items that are deductible or taxable for tax purposes only. These items are not treated as revenue or expense for book purposes.

+ References

No definition available.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319



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

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-Name Accounting Standards Codification

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-Name Accounting Standards Codification

-Topic 235

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-Section S99

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-Name Regulation S-X (SX)

-Number 210

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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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