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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 |  | $ 8,800,000 us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities | $ 10,000,000 us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities |
Other deferred tax assets |  | 38,400,000 us-gaap_DeferredTaxAssetsOther |  |
State net operating losses |  | 164,000,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal |  |
Unrecognized tax benefits |  | 0 us-gaap_UnrecognizedTaxBenefits |  |
Reduction in deferred tax liabilities due to statutory tax rates in Canada being lower than those in the United States | 5,100,000 us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings |  |  |
Unremitted Foreign Earnings |  | 47,500,000 pten_UnremittedForeignEarnings |  |
Unrecognized deferred tax liability associated with undistributed foreign earnings |  | 7,200,000 us-gaap_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfForeignSubsidiaries |  |
State and Local Jurisdiction | Expire in 2016 |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating losses carried forward |  | 6,800,000 us-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 |  | 630,000 us-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 |  | 16,900,000 us-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 |  | 31,900,000 us-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 |  | 25,700,000 us-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 |  | $ 82,500,000 us-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 Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards that are subject to expiration dates. + References No definition available. + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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- Definition 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. + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition 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. + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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