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Earnings (Losses) Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Net income (loss) (numerator): |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations, net of tax | $ (886,401)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 102,430 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 65,729 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 48,977 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 128,516 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ (90,510)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 28,128 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 92,207 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ (669,265)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 158,341 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 232,974 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Less: Net (income) loss attributable to noncontrolling interest | (202)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (387)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (253)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (573)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (1,026)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (441)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (5,616)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (97)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (1,415)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (7,180)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (621)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Less: loss on redemption of subsidiary preferred stock |  |  |  |  |  |  |  |  | (1,688)nbr_LossOnRedemptionOfSubsidiaryPreferredStock |  |
Less: (earnings) losses allocated to unvested shareholders |  |  |  |  |  |  |  |  | 10,595 us-gaap_UndistributedEarningsAllocatedToParticipatingSecurities | (1,277)us-gaap_UndistributedEarningsAllocatedToParticipatingSecurities |
Adjusted income (loss) from continuing operations attributed to common shareholders |  |  |  |  |  |  |  |  | (661,773)us-gaap_IncomeLossFromContinuingOperations | 149,884 us-gaap_IncomeLossFromContinuingOperations | 232,353 us-gaap_IncomeLossFromContinuingOperations
Income (loss) from discontinued operations, net of tax | $ (4,467)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | $ 4,005 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | $ (1,032)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | $ 1,515 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | $ 23,113 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | $ (14,430)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | $ (26,873)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | $ 7,011 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | $ 21 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | $ (11,179)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | $ (67,526)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Earnings (losses) per share: |  |  |  |  |  |  |  |  |  |  |
Basic from continuing operations (in dollars per share) | $ (3.06)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.34 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.21 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.16 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.43 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ (0.30)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.08 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.31 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ (2.28)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.51 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.80 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Basic from discontinued operations (in dollars per share) | $ (0.02)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.02 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare |  | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.07 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ (0.05)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ (0.09)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.03 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare |  | $ (0.04)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ (0.23)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Total Basic (in dollars per share) | $ (3.08)us-gaap_EarningsPerShareBasic | $ 0.36 us-gaap_EarningsPerShareBasic | $ 0.21 us-gaap_EarningsPerShareBasic | $ 0.17 us-gaap_EarningsPerShareBasic | $ 0.50 us-gaap_EarningsPerShareBasic | $ (0.35)us-gaap_EarningsPerShareBasic | $ (0.01)us-gaap_EarningsPerShareBasic | $ 0.34 us-gaap_EarningsPerShareBasic | $ (2.28)us-gaap_EarningsPerShareBasic | $ 0.47 us-gaap_EarningsPerShareBasic | $ 0.57 us-gaap_EarningsPerShareBasic
Diluted from continuing operations (in dollars per share) | $ (3.06)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.34 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.21 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.16 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.42 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ (0.30)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.08 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.31 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ (2.28)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.51 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.79 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Diluted from discontinued operations (in dollars per share) | $ (0.02)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare |  |  | $ 0.08 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ (0.05)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ (0.09)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.02 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare |  | $ (0.04)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ (0.23)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Total Diluted (in dollars per share) | $ (3.08)us-gaap_EarningsPerShareDiluted | $ 0.35 us-gaap_EarningsPerShareDiluted | $ 0.21 us-gaap_EarningsPerShareDiluted | $ 0.16 us-gaap_EarningsPerShareDiluted | $ 0.50 us-gaap_EarningsPerShareDiluted | $ (0.35)us-gaap_EarningsPerShareDiluted | $ (0.01)us-gaap_EarningsPerShareDiluted | $ 0.33 us-gaap_EarningsPerShareDiluted | $ (2.28)us-gaap_EarningsPerShareDiluted | $ 0.47 us-gaap_EarningsPerShareDiluted | $ 0.56 us-gaap_EarningsPerShareDiluted
Shares (denominator): |  |  |  |  |  |  |  |  |  |  |
Weighted-average number of shares outstanding - basic |  |  |  |  |  |  |  |  | 290,694 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 294,182 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 289,965 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Net effect of dilutive stock options, warrants and restricted stock awards based on the if-converted method (in shares) |  |  |  |  |  |  |  |  |  | 2,410 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 2,358 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted Average Number of Shares Outstanding, Diluted, Total |  |  |  |  |  |  |  |  | 290,694 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 296,592 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 292,323 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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