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v2.4.1.9

Common Shares (Details 2) (USD $) | 0 Months Ended |
--- | --- | ---
Jul. 16, 2012 | Jul. 16, 2012
Series A Preferred Stock |  |
Shareholder Rights Plan |  |
Par value (in dollars per share) | $ 0.001 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | $ 0.001 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember
Right to Purchase Series A Junior Participating Preferred Shares |  |
Shareholder Rights Plan |  |
Number of purchase rights issued per Common Share | $ 1 nbr_ClassOfWarrantOrRightNumberOfRightsIssuedPerShareOfCommonStock / us-gaap_ClassOfWarrantOrRightAxis = nbr_RightToPurchaseSeriesJuniorParticipatingPreferredShares1Member | $ 1 nbr_ClassOfWarrantOrRightNumberOfRightsIssuedPerShareOfCommonStock / us-gaap_ClassOfWarrantOrRightAxis = nbr_RightToPurchaseSeriesJuniorParticipatingPreferredShares1Member
Number of shares each Right entitled to purchase | 0.001 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_ClassOfWarrantOrRightAxis = nbr_RightToPurchaseSeriesJuniorParticipatingPreferredShares1Member | 0.001 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_ClassOfWarrantOrRightAxis = nbr_RightToPurchaseSeriesJuniorParticipatingPreferredShares1Member
Exercise price (in dollars per share) | 80.00 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights / us-gaap_ClassOfWarrantOrRightAxis = nbr_RightToPurchaseSeriesJuniorParticipatingPreferredShares1Member | 80.00 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights / us-gaap_ClassOfWarrantOrRightAxis = nbr_RightToPurchaseSeriesJuniorParticipatingPreferredShares1Member
Minimum percentage holding of common shares for exercising preferred share purchase rights | 10.00%nbr_MinimumPercentageHoldingOfCommonSharesForExercisingPreferredSharePurchaseRights / us-gaap_ClassOfWarrantOrRightAxis = nbr_RightToPurchaseSeriesJuniorParticipatingPreferredShares1Member |
Conditions of rights issuance, number of days following announcement | 10 days |
Conditions of rights issuance, business days following Commencement or Announcement to make an offer | 10 days |
Right to Purchase Series A Junior Participating Preferred Shares | Maximum |  |
Shareholder Rights Plan |  |
Conditions of rights issuance, number of days following announcement | 20 days |

X
- Definition Represents the number of business days that the rights become exercisable following a the commencement of, or announcement of an intention to make, a tender offer or exchange offer the consummation of which would result in the beneficial ownership by a person or group of 10% or more of the issued and outstanding Common Shares. + References No definition available. + Details
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- Definition Represents the number of days that the rights become exercisable following a public announcement of an acquisition, or right to acquire, beneficial ownership of 10 percent or more of the entity's outstanding common stock shares. + References No definition available. + Details
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- Definition The number of rights issued for each share of common stock outstanding. + References No definition available. + Details
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- Definition Represents the minimum percentage holding of common shares for exercising preferred share purchase rights. + References No definition available. + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Subparagraph 4 -Article 4 + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Subparagraph 2 -Article 4 + Details
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- Definition Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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