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v2.4.1.9

Fair Value Measurements (Details 2) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013
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Fair Value of Financial Instruments |  |  |
Carrying Value | $ 4,357,098 us-gaap_DebtInstrumentCarryingAmount | $ 3,983,490 us-gaap_DebtInstrumentCarryingAmount |
Fair Value | 4,414,090 us-gaap_DebtInstrumentFairValue | 4,251,473 us-gaap_DebtInstrumentFairValue |
Subsidiary preferred stock, carrying value |  | 69,188 us-gaap_TemporaryEquityCarryingAmountAttributableToNoncontrollingInterest |
Subsidiary preferred stock, fair value |  | 69,000 nbr_TemporaryEquityFairValue |
Subsidiary preferred stock, effective interest rate (as a percent) | 0.00%nbr_TemporaryEquityInterestRateEffectivePercentage | 4.00%nbr_TemporaryEquityInterestRateEffectivePercentage |
Short term investments: | 35,020 us-gaap_AvailableForSaleSecurities | 117,218 us-gaap_AvailableForSaleSecurities |
Senior Notes Due September 2016 |  |  |
Fair Value of Financial Instruments |  |  |
Carrying Value | 349,887 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroOneSixMember | 349,820 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroOneSixMember |
Fair Value | 346,980 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroOneSixMember | 354,694 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroOneSixMember |
Interest rate on senior notes due (as a percent) | 2.35%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroOneSixMember |  | 2.35%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroOneSixMember
Effective Interest Rate (as a percent) | 2.56%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroOneSixMember | 2.56%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroOneSixMember |
Senior Notes Due February 2018 |  |  |
Fair Value of Financial Instruments |  |  |
Carrying Value | 930,693 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroOneEightMember | 969,928 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroOneEightMember |
Fair Value | 991,920 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroOneEightMember | 1,097,480 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroOneEightMember |
Interest rate on senior notes due (as a percent) | 6.15%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroOneEightMember |  |
Effective Interest Rate (as a percent) | 6.42%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroOneEightMember | 6.42%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroOneEightMember |
Senior Notes Due January 2019 |  |  |
Fair Value of Financial Instruments |  |  |
Carrying Value | 339,607 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroOneNineMember | 339,607 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroOneNineMember |
Fair Value | 403,531 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroOneNineMember | 428,733 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroOneNineMember |
Interest rate on senior notes due (as a percent) | 9.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroOneNineMember | 9.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroOneNineMember | 9.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroOneNineMember
Effective Interest Rate (as a percent) | 9.33%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroOneNineMember | 9.33%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroOneNineMember |
Senior Notes Due September 2020 |  |  |
Fair Value of Financial Instruments |  |  |
Carrying Value | 698,253 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroTwoZeroMember | 697,947 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroTwoZeroMember |
Fair Value | 687,953 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroTwoZeroMember | 731,955 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroTwoZeroMember |
Interest rate on senior notes due (as a percent) | 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroTwoZeroMember |  |
Effective Interest Rate (as a percent) | 5.20%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroTwoZeroMember | 5.20%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroTwoZeroMember |
Senior Notes Due September 2021 |  |  |
Fair Value of Financial Instruments |  |  |
Carrying Value | 698,388 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroTwoOneMember | 698,148 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroTwoOneMember |
Fair Value | 661,619 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroTwoOneMember | 709,793 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroTwoOneMember |
Interest rate on senior notes due (as a percent) | 4.625%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroTwoOneMember |  |
Effective Interest Rate (as a percent) | 4.75%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroTwoOneMember | 4.75%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroTwoOneMember |
Senior Notes Due September 2023 |  |  |
Fair Value of Financial Instruments |  |  |
Carrying Value | 348,893 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroTwoThreeMember | 348,765 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroTwoThreeMember |
Fair Value | 332,759 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroTwoThreeMember | 349,731 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroTwoThreeMember |
Interest rate on senior notes due (as a percent) | 5.10%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroTwoThreeMember |  | 5.10%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroTwoThreeMember
Effective Interest Rate (as a percent) | 5.26%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroTwoThreeMember | 5.26%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroTwoThreeMember |
Revolving Credit Facility |  |  |
Fair Value of Financial Instruments |  |  |
Carrying Value | 450,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember | 170,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember |
Fair Value | 450,000 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember | 170,000 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember |
Effective Interest Rate (as a percent) | 3.47%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember | 2.28%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember |
Commercial Paper |  |  |
Fair Value of Financial Instruments |  |  |
Carrying Value | 533,119 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = us-gaap_CommercialPaperMember | 329,844 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = us-gaap_CommercialPaperMember |
Fair Value | 533,119 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = us-gaap_CommercialPaperMember | 329,844 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = us-gaap_CommercialPaperMember |
Effective Interest Rate (as a percent) | 0.59%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = us-gaap_CommercialPaperMember | 0.45%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = us-gaap_CommercialPaperMember |
Other |  |  |
Fair Value of Financial Instruments |  |  |
Carrying Value | 6,209 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = nbr_SeniorDebtDueOthersMember | 10,243 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = nbr_SeniorDebtDueOthersMember |
Fair Value | $ 6,209 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = nbr_SeniorDebtDueOthersMember | $ 10,243 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = nbr_SeniorDebtDueOthersMember |
Effective Interest Rate (as a percent) | 0.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = nbr_SeniorDebtDueOthersMember | 0.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = nbr_SeniorDebtDueOthersMember |

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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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- Definition Carrying amount, attributable to noncontrolling interests, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer. + References No definition available. + Details
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