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Compensation Expense Associated with Stock-Settled Performance Units (Detail) (Performance Units Awards, USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
2014 |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Stock-based compensation expense associated with Stock-Settled Performance Units | $ 449 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardDateAxis = pten_YearTwentyFourteenMember / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |
2013 |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Stock-based compensation expense associated with Stock-Settled Performance Units | 464 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardDateAxis = pten_YearTwentyThirteenMember / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember | 464 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardDateAxis = pten_YearTwentyThirteenMember / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember
2012 |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Stock-based compensation expense associated with Stock-Settled Performance Units | 255 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardDateAxis = pten_YearTwentyTwelveMember / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember | 255 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardDateAxis = pten_YearTwentyTwelveMember / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember
2011 |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Stock-based compensation expense associated with Stock-Settled Performance Units |  | $ 464 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardDateAxis = pten_YearTwentyElevenMember / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
Name: | us-gaap_AllocatedShareBasedCompensationExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration