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Additional Information with Respect to Non-vested Shares (Detail) (Employee Stock Option, USD $) | 12 Months Ended
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Dec. 31, 2014
Employee Stock Option |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Aggregate intrinsic value (in thousands) | $ 33,000 pten_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpectedToVestAggregateIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Weighted-average remaining contractual term | 8 years 9 months 7 days
Weighted-average remaining expected term | 3 years 9 months 7 days
Weighted-average remaining vesting period | 1 year 7 months 17 days
Unrecognized compensation cost | $ 6,000,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember

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- Definition Share Based Compensation Arrangement by Share Based Payment Award, Options, Expected to Vest, Aggregate Intrinsic Value + References No definition available. + Details
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- Definition Share Based Compensation Arrangement By Share Based Payment Award Options Expected To Vest Weighted Average Remaining Contractual Term 1 + References No definition available. + Details
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- Definition Share Based Compensation Arrangement By Share Based Payment Award Options Expected To Vest Weighted Average Remaining Expected Term + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Remaining Contractual Term + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Details
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