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Debt (Details 2) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013
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Maturity of primary debt |  |  |
2016 | $ 350,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo |  |
2017 | 983,119 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree |  |
2018 | 934,372 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour |  |
2019 | 339,607 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive |  |
Thereafter | 1,750,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive |  |
Long-term debt total | 4,357,098 us-gaap_DebtInstrumentCarryingAmount | 3,983,490 us-gaap_DebtInstrumentCarryingAmount |
Senior Notes Due September 2016 |  |  |
Debt |  |  |
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
Maturity of primary debt |  |  |
Long-term debt total | 349,887 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroOneSixMember | 349,820 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroOneSixMember |
Senior Notes Due February 2018 |  |  |
Debt |  |  |
Interest rate on senior notes due (as a percent) | 6.15%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroOneEightMember |  |
Maturity of primary debt |  |  |
Long-term debt total | 930,693 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroOneEightMember | 969,928 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroOneEightMember |
Senior Notes Due January 2019 |  |  |
Debt |  |  |
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
Maturity of primary debt |  |  |
Long-term debt total | 339,607 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroOneNineMember | 339,607 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroOneNineMember |
Senior Notes Due September 2020 |  |  |
Debt |  |  |
Interest rate on senior notes due (as a percent) | 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroTwoZeroMember |  |
Maturity of primary debt |  |  |
Long-term debt total | 698,253 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroTwoZeroMember | 697,947 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroTwoZeroMember |
Senior Notes Due September 2021 |  |  |
Debt |  |  |
Interest rate on senior notes due (as a percent) | 4.625%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroTwoOneMember |  |
Maturity of primary debt |  |  |
Long-term debt total | 698,388 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroTwoOneMember | 698,148 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroTwoOneMember |
Senior Notes Due September 2023 |  |  |
Debt |  |  |
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
Maturity of primary debt |  |  |
Long-term debt total | $ 348,893 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroTwoThreeMember | $ 348,765 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = nbr_SeniorNotesDueTwoZeroTwoThreeMember |

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