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Stock-based Compensation - Additional Information (Detail) (USD $) | 12 Months Ended | 1 Months Ended |
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Apr. 30, 2013 | Apr. 30, 2014 | Apr. 30, 2012
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Treasury stock acquisition price | $ 18,147,000 us-gaap_TreasuryStockValueAcquiredCostMethod | $ 85,837,000 us-gaap_TreasuryStockValueAcquiredCostMethod | $ 170,292,000 us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |
Employee Stock Option |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Treasury stock shares acquired | 190,919 us-gaap_TreasuryStockSharesAcquired / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |
Options outstanding, aggregate intrinsic value | 4,300,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |
Options outstanding, weighted-average remaining contractual term | 4 years 11 months 1 day |  |  |  |  |
Options exercisable, aggregate intrinsic value | 4,200,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |
Options exercisable, weighted-average remaining contractual term | 4 years 3 months 11 days |  |  |  |  |
Outstanding non-vested options | 862,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |
Employee Stock Option | Acquired to satisfy the exercise price |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Treasury stock acquisition price | 4,600,000 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / pten_TreasuryStockActivityByTypeAxis = pten_TransactionOneMember |  |  |  |  |
Employee Stock Option | Acquired to satisfy payroll tax withholding obligations |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Treasury stock acquisition price | 1,600,000 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / pten_TreasuryStockActivityByTypeAxis = pten_TransactionTwoMember |  |  |  |  |
Restricted Stock Awards |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Outstanding non-vested restricted stock | 1,400,000 pten_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndExpectedToVestOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  |  |  |
Performance Units Awards |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Award description | Generally, the recipients will receive a target number of shares if the Company’s total shareholder return is positive and, when compared to the peer group, is at the 50th percentile and two times the target if at the 75th percentile or higher. |  |  |  |  |
Performance period | 3 years |  |  |  |  |
Performance Units Awards | 2009 |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Award description | Generally, the recipients would receive a target payment if the Company’s total shareholder return was positive and, when compared to the peer group, was at or above the 50th percentile but less than the 75th percentile and two times the target if at the 75th percentile or higher. |  |  |  |  |
Target awards payment | 3,400,000 pten_PerformanceBasedAwardTargetShareAmount / us-gaap_AwardDateAxis = pten_YearTwoThousandNineMember / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |  |  |  |  |
Pro-rated obligation |  |  |  |  |  | 1,700,000 us-gaap_AccruedBonusesCurrentAndNoncurrent / us-gaap_AwardDateAxis = pten_YearTwoThousandNineMember / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember
Compensation expense |  |  | (1,900,000)us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardDateAxis = pten_YearTwoThousandNineMember / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |  |  |
Performance Units Awards | 2010 |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Compensation expense |  | 260,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardDateAxis = pten_YearTwentyTenMember / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember | 1,039,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardDateAxis = pten_YearTwentyTenMember / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |  |  |
Shares issued |  |  |  | 357,500 us-gaap_StockIssuedDuringPeriodSharesOther / us-gaap_AwardDateAxis = pten_YearTwentyTenMember / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |  |
Performance Units Awards | 2011 |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Compensation expense | $ 464,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardDateAxis = pten_YearTwentyElevenMember / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember | $ 1,856,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardDateAxis = pten_YearTwentyElevenMember / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember | $ 1,856,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardDateAxis = pten_YearTwentyElevenMember / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |  |  |
Shares issued |  |  |  |  | 288,750 us-gaap_StockIssuedDuringPeriodSharesOther / us-gaap_AwardDateAxis = pten_YearTwentyElevenMember / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |
Patterson-UTI Energy, Inc. 2014 Long-Term Incentive Plan | Maximum |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Option term | 10 years |  |  |  |  |
Patterson-UTI Energy, Inc. 2014 Long-Term Incentive Plan | Non Employee Director |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Awards vesting period | 1 year |  |  |  |  |
Patterson-UTI Energy, Inc. 2014 Long-Term Incentive Plan | Employees |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Awards vesting period | 3 years |  |  |  |  |
Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan, as amended | Non Employee Director | Employee Stock Option |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Awards vesting period | 1 year |  |  |  |  |
Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan, as amended | Non Employee Director | Restricted Stock Awards |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Awards vesting period | 1 year |  |  |  |  |
Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan, as amended | Employees | Employee Stock Option |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Awards vesting period | 3 years |  |  |  |  |
Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan, as amended | Employees | Restricted Stock Awards |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Awards vesting period | 3 years |  |  |  |  |
Patterson-UTI Energy, Inc. Amended and Restated 1997 Long-Term Incentive Plan, as amended ("1997 Plan") | Restricted Stock Awards |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Awards vesting period | 4 years |  |  |  |  |
Patterson-UTI Energy, Inc. Amended and Restated 1997 Long-Term Incentive Plan, as amended ("1997 Plan") | Maximum | Employee Stock Option |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Awards vesting period | 5 years |  |  |  |  |
Option term | 10 years |  |  |  |  |
Patterson-UTI Energy, Inc. Amended and Restated 1997 Long-Term Incentive Plan, as amended ("1997 Plan") | Minimum | Employee Stock Option |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Awards vesting period | 3 years |  |  |  |  |

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- Definition Carrying value as of the balance sheet date of obligations incurred and payable for incentive compensation awarded to employees and directors or earned by them based on the terms of one or more relevant arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph a -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph 5 -Article 9 + Details
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- Definition General descriptive information regarding an arrangement under which employees and directors receive: (a) awards of equity shares, equity share options, or other equity instruments; or (b) the entity incurs liabilities to them: (1) in amounts based, at least in part, on the price of the entity's shares or other equity instruments; or (2) that require or may require settlement by issuance of the entity's shares. Such an arrangement is usually provided to employees and directors to compensate them, provide performance incentives to them, and to attract or retain their services. May also include pertinent information particular to a plan that is not elsewhere specified in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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