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Summary of Significant Accounting Policies (Details 3) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Change in the carrying amount of goodwill for various contract drilling segments and other operating segments |  |  |
Goodwill, Beginning Balance | $ 512,964,000 us-gaap_Goodwill | $ 472,326,000 us-gaap_Goodwill |
Acquisitions and purchase price adjustment | 18,818,000 nbr_GoodwillAcquisitionsAndPurchasePriceAdjustments | 51,318,000 nbr_GoodwillAcquisitionsAndPurchasePriceAdjustments |
Disposals and Impairments | (356,605,000)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit | (9,631,000)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit |
Cumulative Translation Adjustment | (1,249,000)us-gaap_GoodwillTranslationAdjustments | (1,049,000)us-gaap_GoodwillTranslationAdjustments |
Goodwill, Ending Balance | 173,928,000 us-gaap_Goodwill | 512,964,000 us-gaap_Goodwill |
Discontinued Operation, additional disclosures |  |  |
Goodwill for the consolidated company, expected to be deductible for tax purposes | 75,600,000 nbr_GoodwillExpectedToBeDeductibleForTaxPurposes |  |
Subtotal drilling and rig services |  |  |
Change in the carrying amount of goodwill for various contract drilling segments and other operating segments |  |  |
Goodwill, Beginning Balance | 87,410,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = nbr_DrillingAndRigServicesMember | 82,262,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = nbr_DrillingAndRigServicesMember |
Acquisitions and purchase price adjustment | 17,268,000 nbr_GoodwillAcquisitionsAndPurchasePriceAdjustments / us-gaap_StatementBusinessSegmentsAxis = nbr_DrillingAndRigServicesMember | 15,828,000 nbr_GoodwillAcquisitionsAndPurchasePriceAdjustments / us-gaap_StatementBusinessSegmentsAxis = nbr_DrillingAndRigServicesMember |
Disposals and Impairments | (21,613,000)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit / us-gaap_StatementBusinessSegmentsAxis = nbr_DrillingAndRigServicesMember | (9,631,000)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit / us-gaap_StatementBusinessSegmentsAxis = nbr_DrillingAndRigServicesMember |
Cumulative Translation Adjustment | (1,249,000)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = nbr_DrillingAndRigServicesMember | (1,049,000)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = nbr_DrillingAndRigServicesMember |
Goodwill, Ending Balance | 81,816,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = nbr_DrillingAndRigServicesMember | 87,410,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = nbr_DrillingAndRigServicesMember |
U.S. |  |  |
Change in the carrying amount of goodwill for various contract drilling segments and other operating segments |  |  |
Goodwill, Beginning Balance |  |  | 50,149,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = country_US
Goodwill, Ending Balance | 50,149,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = country_US | 50,149,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = country_US | 50,149,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = country_US
Rig Services |  |  |
Change in the carrying amount of goodwill for various contract drilling segments and other operating segments |  |  |
Goodwill, Beginning Balance | 37,261,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = nbr_RigServicesMember | 32,113,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = nbr_RigServicesMember |
Acquisitions and purchase price adjustment | 17,268,000 nbr_GoodwillAcquisitionsAndPurchasePriceAdjustments / us-gaap_StatementBusinessSegmentsAxis = nbr_RigServicesMember | 15,828,000 nbr_GoodwillAcquisitionsAndPurchasePriceAdjustments / us-gaap_StatementBusinessSegmentsAxis = nbr_RigServicesMember |
Disposals and Impairments | (21,613,000)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit / us-gaap_StatementBusinessSegmentsAxis = nbr_RigServicesMember | (9,631,000)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit / us-gaap_StatementBusinessSegmentsAxis = nbr_RigServicesMember |
Cumulative Translation Adjustment | (1,249,000)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = nbr_RigServicesMember | (1,049,000)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = nbr_RigServicesMember |
Goodwill, Ending Balance | 31,667,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = nbr_RigServicesMember | 37,261,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = nbr_RigServicesMember |
Subtotal completion and production services |  |  |
Change in the carrying amount of goodwill for various contract drilling segments and other operating segments |  |  |
Goodwill, Beginning Balance | 425,554,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = nbr_CompletionAndProductionServicesMember | 390,064,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = nbr_CompletionAndProductionServicesMember |
Acquisitions and purchase price adjustment | 1,550,000 nbr_GoodwillAcquisitionsAndPurchasePriceAdjustments / us-gaap_StatementBusinessSegmentsAxis = nbr_CompletionAndProductionServicesMember | 35,490,000 nbr_GoodwillAcquisitionsAndPurchasePriceAdjustments / us-gaap_StatementBusinessSegmentsAxis = nbr_CompletionAndProductionServicesMember |
Disposals and Impairments | (334,992,000)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit / us-gaap_StatementBusinessSegmentsAxis = nbr_CompletionAndProductionServicesMember |  |
Goodwill, Ending Balance | 92,112,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = nbr_CompletionAndProductionServicesMember | 425,554,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = nbr_CompletionAndProductionServicesMember |
Completion Services |  |  |
Change in the carrying amount of goodwill for various contract drilling segments and other operating segments |  |  |
Goodwill, Beginning Balance | 334,992,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = nbr_CompletionServicesMember |  | 334,992,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = nbr_CompletionServicesMember
Disposals and Impairments | (334,992,000)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit / us-gaap_StatementBusinessSegmentsAxis = nbr_CompletionServicesMember |  |
Goodwill, Ending Balance |  |  | 334,992,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = nbr_CompletionServicesMember
Production Services |  |  |
Change in the carrying amount of goodwill for various contract drilling segments and other operating segments |  |  |
Goodwill, Beginning Balance | 90,562,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = nbr_ProductionServicesMember | 55,072,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = nbr_ProductionServicesMember |
Acquisitions and purchase price adjustment | 1,550,000 nbr_GoodwillAcquisitionsAndPurchasePriceAdjustments / us-gaap_StatementBusinessSegmentsAxis = nbr_ProductionServicesMember | 35,490,000 nbr_GoodwillAcquisitionsAndPurchasePriceAdjustments / us-gaap_StatementBusinessSegmentsAxis = nbr_ProductionServicesMember |
Goodwill, Ending Balance | $ 92,112,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = nbr_ProductionServicesMember | $ 90,562,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = nbr_ProductionServicesMember |

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