CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income (loss)	$ (669,244)us-gaap_ProfitLoss	$ 147,162us-gaap_ProfitLoss	$ 165,448us-gaap_ProfitLoss
Adjustments to net income (loss):
Depreciation and amortization	1,145,328	1,099,741	1,055,757
Accretion, depletion and other exploratory expenses	2,981	22,270	2,573
Deferred income tax expense (benefit)	(240,195)	(103,277)	(131,742)
Deferred financing costs amortization	4,231us-gaap_AmortizationOfFinancingCosts	4,255us-gaap_AmortizationOfFinancingCosts	4,294us-gaap_AmortizationOfFinancingCosts
Discount amortization on long-term debt	3,131	2,137	1,908
Impairments and other charges	650,199nbr_ImpairmentsAndOtherCharges	53,905nbr_ImpairmentsAndOtherCharges	311,541nbr_ImpairmentsAndOtherCharges
Losses on debt extinguishment	5,576	211,981
Losses (gains) on long-lived assets, net	353,110us-gaap_GainLossOnDispositionOfAssets1	18,060us-gaap_GainLossOnDispositionOfAssets1	(51,585)us-gaap_GainLossOnDispositionOfAssets1
Losses (gains) on investments, net	(5,580)us-gaap_GainLossOnSaleOfInvestments	(91,480)us-gaap_GainLossOnSaleOfInvestments	(56,925)us-gaap_GainLossOnSaleOfInvestments
Share-based compensation	37,190us-gaap_ShareBasedCompensation	53,255us-gaap_ShareBasedCompensation	18,312us-gaap_ShareBasedCompensation
Foreign currency transaction losses (gains), net	1,021	6,225	4,819
Equity in (earnings) losses of unconsolidated affiliates, net of dividends	7,102	800	299,717
Other	(762)us-gaap_OtherNoncashIncomeExpense	(9,730)us-gaap_OtherNoncashIncomeExpense	1,241us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable	(126,883)	(44,561)	200,537
Inventory	(65,398)us-gaap_IncreaseDecreaseInInventories	39,412us-gaap_IncreaseDecreaseInInventories	14,447us-gaap_IncreaseDecreaseInInventories
Other current assets	118,162	(6,943)	(42,743)
Other long-term assets	(30,475)	42,298	(38,468)
Trade accounts payable and accrued liabilities	267,907	113,550	(224,795)
Income taxes payable	(57,113)	(31,752)	(1,488)
Other long-term liabilities	381,623	(109,085)	29,857
Net cash provided by operating activities	1,781,911	1,418,223	1,562,705
Cash flows from investing activities:
Purchases of investments	(319)us-gaap_PaymentsToAcquireInvestments		(949)us-gaap_PaymentsToAcquireInvestments
Sales and maturities of investments	23,992	164,510	31,944
Proceeds from sale of unconsolidated affiliates	750	12,640	159,529
Cash paid for acquisition of businesses, net	(72,534)	(116,971)
Investment in unconsolidated affiliates	(2,365)	(5,967)	(1,325)
Capital expenditures	(1,821,315)	(1,178,205)	(1,518,628)
Proceeds from sales of assets and insurance claims	156,761	308,538	149,801
Other	(1,879)	(13)
Net cash used for investing activities	(1,716,909)	(815,468)	(1,179,628)
Cash flows from financing activities:
Increase (decrease) in cash overdrafts	(6,151)	(4,421)	1,612
Proceeds from issuance of long-term debt		698,753
Debt issuance costs		(4,500)us-gaap_PaymentsOfDebtIssuanceCosts	(3,433)us-gaap_PaymentsOfDebtIssuanceCosts
Proceeds from revolving credit facilities	465,000		710,000
Proceeds from (payments for) issuance of common shares	30,263	5,383	(3,625)
Repurchase of common shares	(250,037)
Purchase of preferred stock	(70,875)
Reduction in long-term debt		(994,181)us-gaap_RepaymentsOfLongTermDebt	(276,258)us-gaap_RepaymentsOfLongTermDebt
Dividends to shareholders	(59,145)us-gaap_PaymentsOfDividends	(47,168)us-gaap_PaymentsOfDividends
Proceeds from (payment for) commercial paper, net	203,275	329,844
Reduction in revolving credit facilities	(230,932)	(720,000)	(680,000)
Other	(11,550)	6,704	(2,423)
Net cash (used for) provided by financing activities	69,848	(729,586)	(254,127)
Effect of exchange rate changes on cash and cash equivalents	(23,616)	(8,176)	(2,603)
Net increase (decrease) in cash and cash equivalents	111,234	(135,007)	126,347
Cash and cash equivalents, beginning of period	389,915	524,922	398,575
Cash and cash equivalents, end of period	$ 501,149	$ 389,915	$ 524,922

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The cash outflow to reacquire common stock during the period.

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The cash outflow for reacquisition of callable preferred stock.

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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The cash outflow associated with the purchase of all investments (debt, security, other) during the period.

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The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

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The cash inflow from the additional capital contribution to the entity.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

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The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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The net cash inflow or outflow from the excess drawing from an existing cash balance, which will be honored by the bank but reflected as a loan to the drawer.

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The net cash inflow or cash outflow from issuing (borrowing) and repaying commercial paper.

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The cash inflow associated with the sale, maturity and collection of all investments such as debt, security and so forth during the period.

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The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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