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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Cash flows from operating activities:    
Net income (loss) $ 123,545us-gaap_ProfitLoss $ 50,492us-gaap_ProfitLoss
Adjustments to net income (loss):    
Depreciation and amortization 281,019nbr_DepreciationAndAmortizationIncludingDiscontinuedOperations 282,349nbr_DepreciationAndAmortizationIncludingDiscontinuedOperations
Deferred income tax expense (benefit) (68,623)nbr_DeferredIncomeTaxExpenseBenefitIncludingDiscontinuedOperations 451nbr_DeferredIncomeTaxExpenseBenefitIncludingDiscontinuedOperations
Losses (gains) on long-lived assets, net 732us-gaap_GainLossOnDispositionOfAssets1 3,517us-gaap_GainLossOnDispositionOfAssets1
Losses (gains) on investments, net   (7)us-gaap_GainLossOnSaleOfInvestments
Share-based compensation 13,691us-gaap_ShareBasedCompensation 10,685us-gaap_ShareBasedCompensation
Foreign currency transaction losses (gains), net (2,345)us-gaap_ForeignCurrencyTransactionGainLossUnrealized (3,293)us-gaap_ForeignCurrencyTransactionGainLossUnrealized
Gain on merger transaction (52,574)nbr_NetGainLossOnMerger  
Equity in (earnings) losses of unconsolidated affiliates, net of dividends (5,737)us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions 2,445us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions
Other 3,988us-gaap_OtherNoncashIncomeExpense 910us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities, net of effects from acquisitions:    
Accounts receivable 244,544us-gaap_IncreaseDecreaseInAccountsReceivable (57,004)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventory 511us-gaap_IncreaseDecreaseInInventories 14,480us-gaap_IncreaseDecreaseInInventories
Other current assets 13,145us-gaap_IncreaseDecreaseInOtherOperatingAssets 4,742us-gaap_IncreaseDecreaseInOtherOperatingAssets
Other long-term assets (1,665)us-gaap_IncreaseDecreaseInOtherNoncurrentAssets 1,275us-gaap_IncreaseDecreaseInOtherNoncurrentAssets
Trade accounts payable and accrued liabilities (275,313)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (28,471)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Income taxes payable 24,927us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable (26,036)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Other long-term liabilities 7,325us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities 188,028us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities
Net cash provided by operating activities 307,170us-gaap_NetCashProvidedByUsedInOperatingActivities 444,563us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities:    
Purchases of investments 1,710us-gaap_PaymentsToAcquireInvestments (286)us-gaap_PaymentsToAcquireInvestments
Sales and maturities of investments 623us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments 733us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments
Cash paid for acquisition of businesses, net   (10,200)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Investment in unconsolidated affiliates (445)us-gaap_PaymentsToAcquireEquityMethodInvestments (1,255)us-gaap_PaymentsToAcquireEquityMethodInvestments
Proceeds from merger transaction 693,450nbr_CashProceedsFromMerger  
Capital expenditures (364,234)us-gaap_PaymentsToAcquireProductiveAssets (396,465)us-gaap_PaymentsToAcquireProductiveAssets
Proceeds from sales of assets and insurance claims 8,997nbr_ProceedsFromSaleOfProductiveAssetsAndProceedsFromInsuranceSettlement 21,605nbr_ProceedsFromSaleOfProductiveAssetsAndProceedsFromInsuranceSettlement
Net cash provided by (used for) investing activities 340,101us-gaap_NetCashProvidedByUsedInInvestingActivities (385,868)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:    
Increase (decrease) in cash overdrafts (1,017)us-gaap_ProceedsFromRepaymentsOfBankOverdrafts (1,822)us-gaap_ProceedsFromRepaymentsOfBankOverdrafts
Proceeds from (payments for) issuance of common shares 182us-gaap_ProceedsFromIssuanceOfCommonStock 4,931us-gaap_ProceedsFromIssuanceOfCommonStock
Dividends paid to shareholders (17,470)us-gaap_PaymentsOfDividends (11,893)us-gaap_PaymentsOfDividends
Proceeds from (payment for) commercial paper, net (282,615)us-gaap_ProceedsFromRepaymentsOfCommercialPaper (39,594)us-gaap_ProceedsFromRepaymentsOfCommercialPaper
Proceeds from Long-term Lines of Credit   15,000us-gaap_ProceedsFromLongTermLinesOfCredit
Reduction in revolving credit facilities (250,000)us-gaap_RepaymentsOfLongTermLinesOfCredit (67,500)us-gaap_RepaymentsOfLongTermLinesOfCredit
Proceeds from term loan facility 300,000nbr_ProceedsFromLongTermLoanFacility  
Payments on term loan facility (300,000)us-gaap_RepaymentsOfDebt  
Other (4,549)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities (11,585)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Net cash used for financing activities (555,469)us-gaap_NetCashProvidedByUsedInFinancingActivities (112,463)us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of exchange rate changes on cash and cash equivalents (6,950)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (9,266)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net increase (decrease) in cash and cash equivalents 84,852us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (63,034)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of period 501,149us-gaap_CashAndCashEquivalentsAtCarryingValue 389,915us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of period $ 586,001us-gaap_CashAndCashEquivalentsAtCarryingValue $ 326,881us-gaap_CashAndCashEquivalentsAtCarryingValue