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Share-Based Compensation (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Share-based compensation disclosures |  |  |
Share Based Compensation expense | $ 37,200,000 us-gaap_AllocatedShareBasedCompensationExpense | $ 53,300,000 us-gaap_AllocatedShareBasedCompensationExpense | $ 18,300,000 us-gaap_AllocatedShareBasedCompensationExpense
Options |  |  |
Issuance of common shares for stock options exercised (in shares) | (3,000,000)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | (600,000)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | (1,100,000)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Restricted Stock |  |  |
Share-based compensation disclosures |  |  |
Share Based Compensation expense | 35,000,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 51,100,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 14,100,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Number of types of performance share awards | 2 nbr_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfTypesOfPerformanceShareAwards / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |
Option to purchase common stock available for grant | 5,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |
Restricted Stock | Maximum |  |  |
Share-based compensation disclosures |  |  |
Vesting period of shares | 5 years |  |
Stock options |  |  |
Share-based compensation disclosures |  |  |
Option to purchase common stock available for grant | 6,300,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_AwardTypeAxis = nbr_KeyOfficerDirectorAndManagerialEmployeeStockOptionsMember | 7,800,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_AwardTypeAxis = nbr_KeyOfficerDirectorAndManagerialEmployeeStockOptionsMember |
Exercise period | 10 years |  |
Assumptions used to value grant date fair value |  |  |
Weighted-average fair value of options granted (in dollars per share) | $ 6.76 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = nbr_KeyOfficerDirectorAndManagerialEmployeeStockOptionsMember | $ 6.05 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = nbr_KeyOfficerDirectorAndManagerialEmployeeStockOptionsMember | $ 9.40 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = nbr_KeyOfficerDirectorAndManagerialEmployeeStockOptionsMember
Risk free interest rate (as a percent | 1.37%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = nbr_KeyOfficerDirectorAndManagerialEmployeeStockOptionsMember | 0.79%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = nbr_KeyOfficerDirectorAndManagerialEmployeeStockOptionsMember | 0.63%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = nbr_KeyOfficerDirectorAndManagerialEmployeeStockOptionsMember
Dividend yield (as a percent) | 1.21%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = nbr_KeyOfficerDirectorAndManagerialEmployeeStockOptionsMember | 0.84%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = nbr_KeyOfficerDirectorAndManagerialEmployeeStockOptionsMember | 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = nbr_KeyOfficerDirectorAndManagerialEmployeeStockOptionsMember
Expected volatility (as a percent) | 51.01%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate / us-gaap_AwardTypeAxis = nbr_KeyOfficerDirectorAndManagerialEmployeeStockOptionsMember | 51.01%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate / us-gaap_AwardTypeAxis = nbr_KeyOfficerDirectorAndManagerialEmployeeStockOptionsMember | 55.74%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate / us-gaap_AwardTypeAxis = nbr_KeyOfficerDirectorAndManagerialEmployeeStockOptionsMember
Expected term (in years) | 4 years | 4 years | 4 years
Options |  |  |
Options outstanding at the beginning of the period (in shares) | 18,386,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = nbr_KeyOfficerDirectorAndManagerialEmployeeStockOptionsMember |  |
Granted (in shares) | 61,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = nbr_KeyOfficerDirectorAndManagerialEmployeeStockOptionsMember |  |
Issuance of common shares for stock options exercised (in shares) | (3,036,000)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_AwardTypeAxis = nbr_KeyOfficerDirectorAndManagerialEmployeeStockOptionsMember |  |
Forfeited (in shares) | (4,107,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod / us-gaap_AwardTypeAxis = nbr_KeyOfficerDirectorAndManagerialEmployeeStockOptionsMember |  |
Options outstanding at the end of the period (in shares) | 11,304,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = nbr_KeyOfficerDirectorAndManagerialEmployeeStockOptionsMember | 18,386,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = nbr_KeyOfficerDirectorAndManagerialEmployeeStockOptionsMember |
Options exercisable at the end of the period (in shares) | 10,955,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_AwardTypeAxis = nbr_KeyOfficerDirectorAndManagerialEmployeeStockOptionsMember |  |
Weighted Average Exercise Price |  |  |
Options outstanding at the beginning of the period (in dollars per share) | $ 21.10 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = nbr_KeyOfficerDirectorAndManagerialEmployeeStockOptionsMember |  |
Granted (in dollars per share) | $ 17.93 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = nbr_KeyOfficerDirectorAndManagerialEmployeeStockOptionsMember |  |
Exercised (in dollars per share) | $ 9.97 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = nbr_KeyOfficerDirectorAndManagerialEmployeeStockOptionsMember |  |
Forfeited (in dollars per share) | $ 23.16 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = nbr_KeyOfficerDirectorAndManagerialEmployeeStockOptionsMember |  |
Options outstanding at the end of the period (in dollars per share) | $ 23.30 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = nbr_KeyOfficerDirectorAndManagerialEmployeeStockOptionsMember | $ 21.10 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = nbr_KeyOfficerDirectorAndManagerialEmployeeStockOptionsMember |
Options exercisable at the end of the period (in dollars per share) | $ 23.37 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = nbr_KeyOfficerDirectorAndManagerialEmployeeStockOptionsMember |  |
Weighted Average Remaining Contractual Term |  |  |
Options outstanding at the end of the period | 2 years 9 months 22 days |  |
Options exercisable at the end of the period | 2 years 8 months 1 day |  |
Aggregate Intrinsic Value |  |  |
Options outstanding at the end of the period (in dollars) | 12,976,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_AwardTypeAxis = nbr_KeyOfficerDirectorAndManagerialEmployeeStockOptionsMember |  |
Options exercisable at the end of the period (in dollars) | $ 12,948,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 / us-gaap_AwardTypeAxis = nbr_KeyOfficerDirectorAndManagerialEmployeeStockOptionsMember |  |
Stock options | Employees Executives And Directors |  |  |
Options |  |  |
Granted (in shares) | 60,662 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = nbr_KeyOfficerDirectorAndManagerialEmployeeStockOptionsMember / us-gaap_TitleOfIndividualAxis = nbr_EmployeesExecutivsAndDirectorsMember | 63,368 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = nbr_KeyOfficerDirectorAndManagerialEmployeeStockOptionsMember / us-gaap_TitleOfIndividualAxis = nbr_EmployeesExecutivsAndDirectorsMember | 658,061 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = nbr_KeyOfficerDirectorAndManagerialEmployeeStockOptionsMember / us-gaap_TitleOfIndividualAxis = nbr_EmployeesExecutivsAndDirectorsMember
Stock options | Minimum |  |  |
Share-based compensation disclosures |  |  |
Vesting period of shares | 3 years |  |
Stock options | Maximum |  |  |
Share-based compensation disclosures |  |  |
Vesting period of shares | 5 years |  |

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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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