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Income Taxes - Additional Information (Detail) (USD $)	0 Months Ended	12 Months Ended
	Jan. 01, 2010	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2010
Income Taxes [Line Items]
Domestic Production Activities Deduction				9.00%pten_DomesticProductionActivitiesDeduction
Permanent difference, domestic production activities deduction		$ 8,800,000us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities	$ 10,000,000us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities
Other deferred tax assets		38,400,000us-gaap_DeferredTaxAssetsOther
State net operating losses		164,000,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
Unrecognized tax benefits		0us-gaap_UnrecognizedTaxBenefits
Reduction in deferred tax liabilities due to statutory tax rates in Canada being lower than those in the United States	5,100,000us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings
Unremitted Foreign Earnings		47,500,000pten_UnremittedForeignEarnings
Unrecognized deferred tax liability associated with undistributed foreign earnings		7,200,000us-gaap_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfForeignSubsidiaries
State and Local Jurisdiction | Expire in 2016
Income Taxes [Line Items]
Net operating losses carried forward		6,800,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember / pten_OperatingLossCarryforwardsByDurationAxis = pten_ExpireInTwentySixteenMember
State and Local Jurisdiction | Expire in 2025
Income Taxes [Line Items]
Net operating losses carried forward		630,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember / pten_OperatingLossCarryforwardsByDurationAxis = pten_ExpireInTwentyTwentyFiveMember
State and Local Jurisdiction | Expire in 2026
Income Taxes [Line Items]
Net operating losses carried forward		16,900,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember / pten_OperatingLossCarryforwardsByDurationAxis = pten_ExpireInTwentyTwentySixMember
State and Local Jurisdiction | Expire in 2029
Income Taxes [Line Items]
Net operating losses carried forward		31,900,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember / pten_OperatingLossCarryforwardsByDurationAxis = pten_ExpiringInTwentyTwentyNineMember
State and Local Jurisdiction | Expire in 2030
Income Taxes [Line Items]
Net operating losses carried forward		25,700,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember / pten_OperatingLossCarryforwardsByDurationAxis = pten_ExpiringInTwentyThirtyMember
State and Local Jurisdiction | Expire in 2031
Income Taxes [Line Items]
Net operating losses carried forward		$ 82,500,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember / pten_OperatingLossCarryforwardsByDurationAxis = pten_ExpiringInTwentyThirtyOneMember
U.S.
Income Taxes [Line Items]
Tax periods open for examination		Tax years ended December 31, 2011 through December 31, 2013
U.S. | Earliest Tax Year
Income Taxes [Line Items]
Tax period open for examination		2011
U.S. | Latest Tax Year
Income Taxes [Line Items]
Tax period open for examination		2013
Canada
Income Taxes [Line Items]
Tax periods open for examination		Tax years ended December 31, 2010 through December 31, 2013
Canada | Earliest Tax Year
Income Taxes [Line Items]
Tax period open for examination		2010
Canada | Latest Tax Year
Income Taxes [Line Items]
Tax period open for examination		2013

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- Definition

The annual amount of qualifying expenditures that are deductible for tax purposes.

+ References

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Income Tax Examination, Years Open for Examination

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Unremitted Foreign Earnings

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed.

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Amount of deferred tax liability not recognized because of the exceptions to comprehensive recognition of deferred taxes related to undistributed earnings of foreign subsidiaries.

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Amount of the difference between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity.

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Amount 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 repatriation of foreign earnings.

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Tax year that remains open to examination under enacted tax laws, in CCYY format.

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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