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Treasury Stock Acquisition (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Treasury Stock [Line Items]
Treasury stock acquired, Shares, Beginning balance	42,268,057us-gaap_TreasuryStockShares	38,146,738us-gaap_TreasuryStockShares	27,487,571us-gaap_TreasuryStockShares
Treasury stock acquired, Shares, Ending balance	42,818,585us-gaap_TreasuryStockShares	42,268,057us-gaap_TreasuryStockShares	38,146,738us-gaap_TreasuryStockShares
Treasury stock acquired, Values, Beginning balance	$ 880,888us-gaap_TreasuryStockValue	$ 795,051us-gaap_TreasuryStockValue	$ 624,759us-gaap_TreasuryStockValue
Treasury stock acquired, Values	18,147us-gaap_TreasuryStockValueAcquiredCostMethod	85,837us-gaap_TreasuryStockValueAcquiredCostMethod	170,292us-gaap_TreasuryStockValueAcquiredCostMethod
Treasury stock acquired, Values, Ending balance	899,035us-gaap_TreasuryStockValue	880,888us-gaap_TreasuryStockValue	795,051us-gaap_TreasuryStockValue
2007 Program
Schedule of Treasury Stock [Line Items]
Treasury stock acquired, Shares			4,708,784us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = pten_StockRepurchasePlanMember
Treasury stock acquired, Values			70,092us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_ShareRepurchaseProgramAxis = pten_StockRepurchasePlanMember
2012 Program
Schedule of Treasury Stock [Line Items]
Treasury stock acquired, Shares		2,567,266us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = pten_StockRepurchasePlanOneMember	5,863,451us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = pten_StockRepurchasePlanOneMember
Treasury stock acquired, Values		51,107us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_ShareRepurchaseProgramAxis = pten_StockRepurchasePlanOneMember	98,892us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_ShareRepurchaseProgramAxis = pten_StockRepurchasePlanOneMember
2013 Program
Schedule of Treasury Stock [Line Items]
Treasury stock acquired, Shares	13,898us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = pten_StockRepurchasePlanTwoMember	602,564us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = pten_StockRepurchasePlanTwoMember
Treasury stock acquired, Values	466us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_ShareRepurchaseProgramAxis = pten_StockRepurchasePlanTwoMember	12,517us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_ShareRepurchaseProgramAxis = pten_StockRepurchasePlanTwoMember
Long Term Incentive Plan
Schedule of Treasury Stock [Line Items]
Treasury stock acquired, Shares	536,630us-gaap_TreasuryStockSharesAcquired / us-gaap_PlanNameAxis = pten_LongTermIncentivePlanMember	951,489us-gaap_TreasuryStockSharesAcquired / us-gaap_PlanNameAxis = pten_LongTermIncentivePlanMember	86,932us-gaap_TreasuryStockSharesAcquired / us-gaap_PlanNameAxis = pten_LongTermIncentivePlanMember
Treasury stock acquired, Values	$ 17,681us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_PlanNameAxis = pten_LongTermIncentivePlanMember	$ 22,213us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_PlanNameAxis = pten_LongTermIncentivePlanMember	$ 1,308us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_PlanNameAxis = pten_LongTermIncentivePlanMember

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

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Number of shares that have been repurchased during the period and are being held in treasury.

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The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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