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Supplemental Balance Sheet, Income Statement and Cash Flow Information (Details 6) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Supplemental cash flow information      
Cash paid for income taxes $ 166,660us-gaap_IncomeTaxesPaid $ 100,749us-gaap_IncomeTaxesPaid $ 85,044us-gaap_IncomeTaxesPaid
Cash paid for interest, net of capitalized interest 164,928us-gaap_InterestPaidNet 239,637us-gaap_InterestPaidNet 250,045us-gaap_InterestPaidNet
Acquisitions of businesses:      
Fair value of assets acquired 59,195us-gaap_FairValueOfAssetsAcquired 140,740us-gaap_FairValueOfAssetsAcquired  
Goodwill 18,818us-gaap_GoodwillAcquiredDuringPeriod 51,318us-gaap_GoodwillAcquiredDuringPeriod  
Liabilities assumed (2,796)us-gaap_LiabilitiesAssumed1 (8,232)us-gaap_LiabilitiesAssumed1  
Future consideration payments (fair value) 2,457nbr_BusinessCombinationConsiderationTransferredFutureConsiderationPayments 64,174nbr_BusinessCombinationConsiderationTransferredFutureConsiderationPayments  
Cash paid for acquisitions of businesses 72,760us-gaap_PaymentsToAcquireBusinessesGross 119,652us-gaap_PaymentsToAcquireBusinessesGross  
Cash acquired in acquisitions of businesses (226)us-gaap_CashAcquiredFromAcquisition (2,681)us-gaap_CashAcquiredFromAcquisition  
Cash paid for acquisition of business, net $ 72,534us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired $ 116,971us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired