XML 30 R43.htm IDEA: XBRL DOCUMENT v2.4.1.9
Share-Based Compensation (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Share-based compensation disclosures      
Share Based Compensation expense $ 13,900,000us-gaap_AllocatedShareBasedCompensationExpense $ 10,700,000us-gaap_AllocatedShareBasedCompensationExpense  
Liability related to awards 118,586,000us-gaap_EmployeeRelatedLiabilitiesCurrent   177,707,000us-gaap_EmployeeRelatedLiabilitiesCurrent
Restricted Stock Award | Employees and Director      
Share-based compensation disclosures      
Shares awarded during period 1,514,934us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= nbr_EmployeesAndDirectorMember
1,106,919us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= nbr_EmployeesAndDirectorMember
 
Aggregate value of restricted stock awards at date of grant 19,300,000nbr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodAggregateGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= nbr_EmployeesAndDirectorMember
25,200,000nbr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodAggregateGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= nbr_EmployeesAndDirectorMember
 
Fair value awards vested 15,700,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= nbr_EmployeesAndDirectorMember
16,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= nbr_EmployeesAndDirectorMember
 
Restricted Stock Award | Maximum | Employees and Director      
Share-based compensation disclosures      
Vesting period of shares 4 years    
Restricted Stock Based on Performance Conditions      
Share-based compensation disclosures      
Fair value awards vested 6,800,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= nbr_RestrictedStockBasedOnPerformanceConditionsMember
5,900,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= nbr_RestrictedStockBasedOnPerformanceConditionsMember
 
Restricted Stock Based on Performance Conditions | Executives      
Share-based compensation disclosures      
Shares awarded during period 438,307us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= nbr_RestrictedStockBasedOnPerformanceConditionsMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
362,311us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= nbr_RestrictedStockBasedOnPerformanceConditionsMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
 
Vesting period of shares 3 years    
Liability related to awards 600,000us-gaap_EmployeeRelatedLiabilitiesCurrent
/ us-gaap_AwardTypeAxis
= nbr_RestrictedStockBasedOnPerformanceConditionsMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
   
Restricted Stock Based on Market Conditions      
Assumptions used to value grant date fair value      
Risk free interest rate (as a percent 1.18%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= nbr_RestrictedStockBasedOnMarketConditionsMember
0.80%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= nbr_RestrictedStockBasedOnMarketConditionsMember
 
Expected volatility (as a percent) 50.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate
/ us-gaap_AwardTypeAxis
= nbr_RestrictedStockBasedOnMarketConditionsMember
40.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate
/ us-gaap_AwardTypeAxis
= nbr_RestrictedStockBasedOnMarketConditionsMember
 
Closing stock price at grant date (in dollars per share) $ 12.98us-gaap_SharePrice
/ us-gaap_AwardTypeAxis
= nbr_RestrictedStockBasedOnMarketConditionsMember
$ 18.19us-gaap_SharePrice
/ us-gaap_AwardTypeAxis
= nbr_RestrictedStockBasedOnMarketConditionsMember
 
Expected term (in years) 3 years 2 years 11 months 19 days  
Restricted Stock Based on Market Conditions | Executives      
Share-based compensation disclosures      
Shares awarded during period 544,925us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= nbr_RestrictedStockBasedOnMarketConditionsMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
395,550us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= nbr_RestrictedStockBasedOnMarketConditionsMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
 
Vesting period of shares 3 years    
Aggregate value of restricted stock awards at date of grant 4,700,000nbr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodAggregateGrantDateFairValue
/ us-gaap_AwardTypeAxis
= nbr_RestrictedStockBasedOnMarketConditionsMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
4,500,000nbr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodAggregateGrantDateFairValue
/ us-gaap_AwardTypeAxis
= nbr_RestrictedStockBasedOnMarketConditionsMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
 
Stock options | Employees and Director      
Share-based compensation disclosures      
Total intrinsic value of stock options exercised 100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_TitleOfIndividualAxis
= nbr_EmployeesAndDirectorMember
6,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_TitleOfIndividualAxis
= nbr_EmployeesAndDirectorMember
 
Total fair value of option vested during the period $ 1,500,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_TitleOfIndividualAxis
= nbr_EmployeesAndDirectorMember
$ 1,500,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_TitleOfIndividualAxis
= nbr_EmployeesAndDirectorMember