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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash flows from operating activities:      
Net income $ 162,664us-gaap_ProfitLoss $ 188,009us-gaap_ProfitLoss $ 299,477us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation, depletion, amortization and impairment 718,730pten_DepreciationDepletionAmortizationAndImpairment 597,469pten_DepreciationDepletionAmortizationAndImpairment 526,614pten_DepreciationDepletionAmortizationAndImpairment
Provision for bad debts 0us-gaap_ProvisionForDoubtfulAccounts 0us-gaap_ProvisionForDoubtfulAccounts 1,100us-gaap_ProvisionForDoubtfulAccounts
Dry holes and abandonments 550us-gaap_ExplorationAbandonmentAndImpairmentExpense 89us-gaap_ExplorationAbandonmentAndImpairmentExpense 308us-gaap_ExplorationAbandonmentAndImpairmentExpense
Deferred income tax expense 43,673us-gaap_DeferredIncomeTaxExpenseBenefit 50,569us-gaap_DeferredIncomeTaxExpenseBenefit 160,436us-gaap_DeferredIncomeTaxExpenseBenefit
Stock-based compensation expense 27,032us-gaap_ShareBasedCompensation 25,891us-gaap_ShareBasedCompensation 23,185us-gaap_ShareBasedCompensation
Net gain on asset disposals (15,781)us-gaap_GainLossOnSaleOfPropertyPlantEquipment [1] (3,384)us-gaap_GainLossOnSaleOfPropertyPlantEquipment [1] (33,806)us-gaap_GainLossOnSaleOfPropertyPlantEquipment [1]
Tax expense related to stock-based compensation     (1,284)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Changes in operating assets and liabilities:      
Accounts receivable (214,059)us-gaap_IncreaseDecreaseInAccountsReceivable 12,007us-gaap_IncreaseDecreaseInAccountsReceivable 52,612us-gaap_IncreaseDecreaseInAccountsReceivable
Income taxes receivable/payable (92,352)pten_IncreaseDecreaseInIncomeTaxesReceivableAndPayable 4,447pten_IncreaseDecreaseInIncomeTaxesReceivableAndPayable 3,506pten_IncreaseDecreaseInIncomeTaxesReceivableAndPayable
Inventory and other assets (5,737)us-gaap_IncreaseDecreaseInInventoriesAndOtherOperatingAssets 570us-gaap_IncreaseDecreaseInInventoriesAndOtherOperatingAssets 5,276us-gaap_IncreaseDecreaseInInventoriesAndOtherOperatingAssets
Accounts payable 86,621us-gaap_IncreaseDecreaseInAccountsPayable 11,331us-gaap_IncreaseDecreaseInAccountsPayable (25,199)us-gaap_IncreaseDecreaseInAccountsPayable
Accrued expenses 12,838us-gaap_IncreaseDecreaseInAccruedLiabilities 1,973us-gaap_IncreaseDecreaseInAccruedLiabilities (6,048)us-gaap_IncreaseDecreaseInAccruedLiabilities
Other liabilities 4,547us-gaap_IncreaseDecreaseInOtherOperatingLiabilities (100)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities (837)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Net cash provided by operating activities 728,726us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 888,871us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 1,005,340us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities:      
Acquisitions (176,301)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired    
Purchases of property and equipment (1,052,341)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (662,461)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (973,988)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from disposal of assets 33,233us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 10,386us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 66,027us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Net cash used in investing activities (1,195,409)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (652,075)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (907,961)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities:      
Purchases of treasury stock (13,554)us-gaap_PaymentsForRepurchaseOfCommonStock (73,510)us-gaap_PaymentsForRepurchaseOfCommonStock (170,292)us-gaap_PaymentsForRepurchaseOfCommonStock
Dividends paid (58,288)us-gaap_PaymentsOfDividends (29,112)us-gaap_PaymentsOfDividends (30,302)us-gaap_PaymentsOfDividends
Tax benefit related to stock-based compensation 8,729us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 4,794us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities  
Proceeds from long-term debt     400,000us-gaap_ProceedsFromIssuanceOfLongTermDebt
Repayment of long-term debt (10,000)us-gaap_RepaymentsOfLongTermDebt (6,250)us-gaap_RepaymentsOfLongTermDebt (93,750)us-gaap_RepaymentsOfLongTermDebt
Proceeds from borrowings under revolving credit facility 349,500us-gaap_ProceedsFromLongTermLinesOfCredit   123,400us-gaap_ProceedsFromLongTermLinesOfCredit
Repayment of borrowings under revolving credit facility (46,500)us-gaap_RepaymentsOfLongTermLinesOfCredit   (233,400)us-gaap_RepaymentsOfLongTermLinesOfCredit
Debt issuance costs     (7,581)us-gaap_PaymentsOfDebtIssuanceCosts
Proceeds from exercise of stock options 30,842us-gaap_ProceedsFromStockOptionsExercised 6,959us-gaap_ProceedsFromStockOptionsExercised 934us-gaap_ProceedsFromStockOptionsExercised
Net cash provided by (used in) financing activities 260,729us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (97,119)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (10,991)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Effect of foreign exchange rate changes on cash (543)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (891)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents 389us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net increase (decrease) in cash and cash equivalents (206,497)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 138,786us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 86,777us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of year 249,509us-gaap_CashAndCashEquivalentsAtCarryingValue 110,723us-gaap_CashAndCashEquivalentsAtCarryingValue 23,946us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of year 43,012us-gaap_CashAndCashEquivalentsAtCarryingValue 249,509us-gaap_CashAndCashEquivalentsAtCarryingValue 110,723us-gaap_CashAndCashEquivalentsAtCarryingValue
Net cash paid during the year for:      
Interest, net of capitalized interest of $6,883 in 2014, $7,775 in 2013 and $8,673 in 2012 (27,813)us-gaap_InterestPaidNet (26,228)us-gaap_InterestPaidNet (16,651)us-gaap_InterestPaidNet
Income taxes (125,953)us-gaap_IncomeTaxesPaidNet (42,600)us-gaap_IncomeTaxesPaidNet (7,964)us-gaap_IncomeTaxesPaidNet
Non-cash investing and financing activities:      
Net increase (decrease) in payables for purchases of property and equipment 122,148us-gaap_CapitalExpendituresIncurredButNotYetPaid (26,899)us-gaap_CapitalExpendituresIncurredButNotYetPaid (27,838)us-gaap_CapitalExpendituresIncurredButNotYetPaid
Net (increase) decrease in deposits on equipment purchases $ (59,819)pten_NetDecreaseIncreaseInDepositsOnEquipmentPurchases $ (8,784)pten_NetDecreaseIncreaseInDepositsOnEquipmentPurchases $ 55,767pten_NetDecreaseIncreaseInDepositsOnEquipmentPurchases
[1] Net gains or losses associated with the disposal of assets relate to corporate strategy decisions of the executive management group. Accordingly, the related gains or losses have been separately presented and excluded from the results of specific segments.