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

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