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Share-Based Compensation (Details 3) (USD $)
12 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 31, 2015
Mar. 31, 2014
Weighted-Average Grant-Date Fair Value          
Liability related to awards $ 177,707,000us-gaap_EmployeeRelatedLiabilitiesCurrent $ 172,803,000us-gaap_EmployeeRelatedLiabilitiesCurrent      
Assumptions used to value grant date fair value          
Closing stock price at grant date (in dollars per share) $ 24.100us-gaap_SharePrice        
Restricted Stock          
Unvested restricted stock          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Beginning Balance 3,764,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
      3,764,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Shares awarded during period 1,169,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
       
Vested (in shares) (1,270,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
       
Forfeited (in shares) (181,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance 3,482,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
       
Weighted-Average Grant-Date Fair Value          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Beginning Balance $ 18.26us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
      $ 18.26us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Granted (in dollars per share) $ 22.80us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
       
Vested (in dollars per share) $ 19.45us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
       
Forfeited (in dollars per share) $ 20.23us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Ending Balance $ 19.25us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
       
Total future compensation cost related to unvested stock that are expected to vest 43,100,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
       
Weighted Average Period for Cost recognition 1 year        
Restricted Stock | Employees and Director          
Unvested restricted stock          
Shares awarded during period 1,169,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= nbr_EmployeesAndDirectorMember
4,493,443us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= nbr_EmployeesAndDirectorMember
944,015us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= nbr_EmployeesAndDirectorMember
   
Weighted-Average Grant-Date Fair Value          
Aggregate value of restricted stock awards at date of grant 26,700,000nbr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodAggregateGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= nbr_EmployeesAndDirectorMember
73,800,000nbr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodAggregateGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= nbr_EmployeesAndDirectorMember
19,500,000nbr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodAggregateGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= nbr_EmployeesAndDirectorMember
   
Fair value awards vested 28,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= nbr_EmployeesAndDirectorMember
37,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= nbr_EmployeesAndDirectorMember
9,700,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= nbr_EmployeesAndDirectorMember
   
Restricted Stock | Maximum          
Share-based compensation disclosures          
Vesting period of shares 5 years        
Restricted Stock | Maximum | Employees and Director          
Share-based compensation disclosures          
Vesting period of shares 4 years        
Restricted Stock Based on Performance Conditions | Executive Officer | Subsequent event          
Share-based compensation disclosures          
Vesting period of shares         3 years
Unvested restricted stock          
Shares awarded during period       438,307us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= nbr_RestrictedStockBasedOnPerformanceConditionsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
362,311us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= nbr_RestrictedStockBasedOnPerformanceConditionsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
Weighted-Average Grant-Date Fair Value          
Liability related to awards   1,800,000us-gaap_EmployeeRelatedLiabilitiesCurrent
/ us-gaap_AwardTypeAxis
= nbr_RestrictedStockBasedOnPerformanceConditionsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
     
Restricted Stock Based on Market Conditions          
Share-based compensation disclosures          
Vesting period of shares 3 years        
Unvested restricted stock          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Beginning Balance 354,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= nbr_RestrictedStockBasedOnMarketConditionsMember
      354,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= nbr_RestrictedStockBasedOnMarketConditionsMember
Shares awarded during period 395,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= nbr_RestrictedStockBasedOnMarketConditionsMember
353,933us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= nbr_RestrictedStockBasedOnMarketConditionsMember
     
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance 749,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= nbr_RestrictedStockBasedOnMarketConditionsMember
354,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= nbr_RestrictedStockBasedOnMarketConditionsMember
     
Weighted-Average Grant-Date Fair Value          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Beginning Balance $ 10.42us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= nbr_RestrictedStockBasedOnMarketConditionsMember
      $ 10.42us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= nbr_RestrictedStockBasedOnMarketConditionsMember
Granted (in dollars per share) $ 11.40us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= nbr_RestrictedStockBasedOnMarketConditionsMember
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Ending Balance $ 10.94us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= nbr_RestrictedStockBasedOnMarketConditionsMember
$ 10.42us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= nbr_RestrictedStockBasedOnMarketConditionsMember
     
Aggregate value of restricted stock awards at date of grant 4,500,000nbr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodAggregateGrantDateFairValue
/ us-gaap_AwardTypeAxis
= nbr_RestrictedStockBasedOnMarketConditionsMember
3,700,000nbr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodAggregateGrantDateFairValue
/ us-gaap_AwardTypeAxis
= nbr_RestrictedStockBasedOnMarketConditionsMember
     
Assumptions used to value grant date fair value          
Risk free interest rate (as a percent 0.80%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= nbr_RestrictedStockBasedOnMarketConditionsMember
0.41%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= nbr_RestrictedStockBasedOnMarketConditionsMember
     
Expected volatility (as a percent) 40.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate
/ us-gaap_AwardTypeAxis
= nbr_RestrictedStockBasedOnMarketConditionsMember
46.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate
/ us-gaap_AwardTypeAxis
= nbr_RestrictedStockBasedOnMarketConditionsMember
     
Closing stock price at grant date (in dollars per share) $ 18.19us-gaap_SharePrice
/ us-gaap_AwardTypeAxis
= nbr_RestrictedStockBasedOnMarketConditionsMember
$ 16.53us-gaap_SharePrice
/ us-gaap_AwardTypeAxis
= nbr_RestrictedStockBasedOnMarketConditionsMember
     
Expected term (in years) 2 years 11 months 19 days 2 years 9 months 26 days      
Restricted Stock Based on Market Conditions | Executive Officer | Subsequent event          
Share-based compensation disclosures          
Vesting period of shares       3 years  
Weighted-Average Grant-Date Fair Value          
Liability related to awards $ 2,500,000us-gaap_EmployeeRelatedLiabilitiesCurrent
/ us-gaap_AwardTypeAxis
= nbr_RestrictedStockBasedOnMarketConditionsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember