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Financial Instruments and Risk Concentration (Details) | Dec. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013
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Senior Notes Due September 2016 |  |  |
Financial Instruments and Risk Concentration |  |  |
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
Senior Notes Due September 2023 |  |  |
Financial Instruments and Risk Concentration |  |  |
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
Senior Notes Due February 2018 |  |  |
Financial Instruments and Risk Concentration |  |  |
Interest rate on senior notes due (as a percent) | 6.15%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroOneEightMember |  |
Senior Notes Due January 2019 |  |  |
Financial Instruments and Risk Concentration |  |  |
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
Senior Notes Due September 2020 |  |  |
Financial Instruments and Risk Concentration |  |  |
Interest rate on senior notes due (as a percent) | 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroTwoZeroMember |  |
Senior Notes Due September 2021 |  |  |
Financial Instruments and Risk Concentration |  |  |
Interest rate on senior notes due (as a percent) | 4.625%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroTwoOneMember |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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