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Quarterly Financial Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Quarterly Financial Information [Line Items] |  |  |
Operating revenues | $ 3,182,291 us-gaap_SalesRevenueNet | $ 2,716,034 us-gaap_SalesRevenueNet | $ 2,723,414 us-gaap_SalesRevenueNet
Operating income | 283,126 us-gaap_OperatingIncomeLoss | 322,191 us-gaap_OperatingIncomeLoss | 497,361 us-gaap_OperatingIncomeLoss
Net income | 162,664 us-gaap_ProfitLoss | 188,009 us-gaap_ProfitLoss | 299,477 us-gaap_ProfitLoss
Net income per common share: |  |  |
Basic | $ 1.12 us-gaap_EarningsPerShareBasic | $ 1.29 us-gaap_EarningsPerShareBasic | $ 1.96 us-gaap_EarningsPerShareBasic
Diluted | $ 1.11 us-gaap_EarningsPerShareDiluted | $ 1.28 us-gaap_EarningsPerShareDiluted | $ 1.96 us-gaap_EarningsPerShareDiluted
First Quarter |  |  |
Quarterly Financial Information [Line Items] |  |  |
Operating revenues | 678,168 us-gaap_SalesRevenueNet / pten_PeriodAxis = pten_FirstQuarterMember | 667,039 us-gaap_SalesRevenueNet / pten_PeriodAxis = pten_FirstQuarterMember |
Operating income | 58,776 us-gaap_OperatingIncomeLoss / pten_PeriodAxis = pten_FirstQuarterMember | 94,932 us-gaap_OperatingIncomeLoss / pten_PeriodAxis = pten_FirstQuarterMember |
Net income | 34,822 us-gaap_ProfitLoss / pten_PeriodAxis = pten_FirstQuarterMember | 56,230 us-gaap_ProfitLoss / pten_PeriodAxis = pten_FirstQuarterMember |
Net income per common share: |  |  |
Basic | $ 0.24 us-gaap_EarningsPerShareBasic / pten_PeriodAxis = pten_FirstQuarterMember | $ 0.38 us-gaap_EarningsPerShareBasic / pten_PeriodAxis = pten_FirstQuarterMember |
Diluted | $ 0.24 us-gaap_EarningsPerShareDiluted / pten_PeriodAxis = pten_FirstQuarterMember | $ 0.38 us-gaap_EarningsPerShareDiluted / pten_PeriodAxis = pten_FirstQuarterMember |
Second Quarter |  |  |
Quarterly Financial Information [Line Items] |  |  |
Operating revenues | 757,276 us-gaap_SalesRevenueNet / pten_PeriodAxis = pten_SecondQuarterMember | 659,316 us-gaap_SalesRevenueNet / pten_PeriodAxis = pten_SecondQuarterMember |
Operating income | 87,226 us-gaap_OperatingIncomeLoss / pten_PeriodAxis = pten_SecondQuarterMember | 70,606 us-gaap_OperatingIncomeLoss / pten_PeriodAxis = pten_SecondQuarterMember |
Net income | 54,283 us-gaap_ProfitLoss / pten_PeriodAxis = pten_SecondQuarterMember | 40,768 us-gaap_ProfitLoss / pten_PeriodAxis = pten_SecondQuarterMember |
Net income per common share: |  |  |
Basic | $ 0.37 us-gaap_EarningsPerShareBasic / pten_PeriodAxis = pten_SecondQuarterMember | $ 0.28 us-gaap_EarningsPerShareBasic / pten_PeriodAxis = pten_SecondQuarterMember |
Diluted | $ 0.37 us-gaap_EarningsPerShareDiluted / pten_PeriodAxis = pten_SecondQuarterMember | $ 0.28 us-gaap_EarningsPerShareDiluted / pten_PeriodAxis = pten_SecondQuarterMember |
Third Quarter |  |  |
Quarterly Financial Information [Line Items] |  |  |
Operating revenues | 845,628 us-gaap_SalesRevenueNet / pten_PeriodAxis = pten_ThirdQuarterMember | 730,907 us-gaap_SalesRevenueNet / pten_PeriodAxis = pten_ThirdQuarterMember |
Operating income | 30,291 us-gaap_OperatingIncomeLoss / pten_PeriodAxis = pten_ThirdQuarterMember | 124,551 us-gaap_OperatingIncomeLoss / pten_PeriodAxis = pten_ThirdQuarterMember |
Net income | 15,976 us-gaap_ProfitLoss / pten_PeriodAxis = pten_ThirdQuarterMember | 74,420 us-gaap_ProfitLoss / pten_PeriodAxis = pten_ThirdQuarterMember |
Net income per common share: |  |  |
Basic | $ 0.11 us-gaap_EarningsPerShareBasic / pten_PeriodAxis = pten_ThirdQuarterMember | $ 0.51 us-gaap_EarningsPerShareBasic / pten_PeriodAxis = pten_ThirdQuarterMember |
Diluted | $ 0.11 us-gaap_EarningsPerShareDiluted / pten_PeriodAxis = pten_ThirdQuarterMember | $ 0.51 us-gaap_EarningsPerShareDiluted / pten_PeriodAxis = pten_ThirdQuarterMember |
Fourth Quarter |  |  |
Quarterly Financial Information [Line Items] |  |  |
Operating revenues | 901,219 us-gaap_SalesRevenueNet / pten_PeriodAxis = pten_FourthQuarterMember | 658,772 us-gaap_SalesRevenueNet / pten_PeriodAxis = pten_FourthQuarterMember |
Operating income | 106,833 us-gaap_OperatingIncomeLoss / pten_PeriodAxis = pten_FourthQuarterMember | 32,102 us-gaap_OperatingIncomeLoss / pten_PeriodAxis = pten_FourthQuarterMember |
Net income | $ 57,583 us-gaap_ProfitLoss / pten_PeriodAxis = pten_FourthQuarterMember | $ 16,591 us-gaap_ProfitLoss / pten_PeriodAxis = pten_FourthQuarterMember |
Net income per common share: |  |  |
Basic | $ 0.39 us-gaap_EarningsPerShareBasic / pten_PeriodAxis = pten_FourthQuarterMember | $ 0.12 us-gaap_EarningsPerShareBasic / pten_PeriodAxis = pten_FourthQuarterMember |
Diluted | $ 0.39 us-gaap_EarningsPerShareDiluted / pten_PeriodAxis = pten_FourthQuarterMember | $ 0.11 us-gaap_EarningsPerShareDiluted / pten_PeriodAxis = pten_FourthQuarterMember |

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