XML 73 R38.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Stock-based Compensation - Additional Information (Detail) (Performance Units Awards) | 3 Months Ended | 0 Months Ended
--- | --- | ---
Mar. 31, 2015 | Apr. 27, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Performance period | 3 years |
Award description | Generally, the recipients will receive a target number of shares if the Company’s total shareholder return is positive and, when compared to the peer group, is at the 50th percentile and two times the target if at the 75th percentile or higher. |
2012 |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Target number of shares | 192,000 pten_PerformanceAwardTargetNumberOfShares / us-gaap_AwardDateAxis = pten_YearTwentyTwelveMember / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |
Subsequent Event | 2012 |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Shares issued |  | 384,000 us-gaap_StockIssuedDuringPeriodSharesOther / us-gaap_AwardDateAxis = pten_YearTwentyTwelveMember / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

X
- Definition Performance award target number of shares. + References No definition available. + Details
Name: | pten_PerformanceAwardTargetNumberOfShares
Namespace Prefix: | pten_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share based compensation arrangement by share based payment award performance period. + References No definition available. + Details
Name: | pten_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformancePeriod
Namespace Prefix: | pten_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition General descriptive information regarding an arrangement under which employees and directors receive: (a) awards of equity shares, equity share options, or other equity instruments; or (b) the entity incurs liabilities to them: (1) in amounts based, at least in part, on the price of the entity's shares or other equity instruments; or (2) that require or may require settlement by issuance of the entity's shares. Such an arrangement is usually provided to employees and directors to compensate them, provide performance incentives to them, and to attract or retain their services. May also include pertinent information particular to a plan that is not elsewhere specified in the taxonomy. + 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 (a) -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 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDescription
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Number of shares of stock issued during the period that is attributable to transactions involving issuance of stock not separately disclosed. + References No definition available. + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesOther
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |