XML 13 R39.htm IDEA: XBRL DOCUMENT v2.4.1.9
Fair Value Measurements (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount $ 91,400,000us-gaap_FairValueAssetsLevel2ToLevel1TransfersAmount $ 0us-gaap_FairValueAssetsLevel2ToLevel1TransfersAmount    
Available-for-sale marketable securities:        
Total fair value of available-for-sale marketable securities 717,562,000us-gaap_AvailableForSaleSecurities   711,915,000us-gaap_AvailableForSaleSecurities  
Convertible senior notes        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Convertible Debt, Noncurrent 162,700,000us-gaap_ConvertibleDebtNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
  169,400,000us-gaap_ConvertibleDebtNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
 
Convertible Debt [Abstract]        
Interest rate, stated percentage 1.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
  1.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
 
Significant Other Observable Inputs (Level 2)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Other than Temporary Impairment Losses, Investments 0us-gaap_ImpairmentOfInvestments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
0us-gaap_ImpairmentOfInvestments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Fair Value, Inputs, Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable Securities, Unrealized Gain (Loss) 0us-gaap_MarketableSecuritiesUnrealizedGainLoss
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
0us-gaap_MarketableSecuritiesUnrealizedGainLoss
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
   
Measured on a recurring basis        
Available-for-sale marketable securities:        
Total fair value of available-for-sale marketable securities 717,562,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
  711,915,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)        
Available-for-sale marketable securities:        
Total fair value of available-for-sale marketable securities 89,580,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
  7,379,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Measured on a recurring basis | Significant Other Observable Inputs (Level 2)        
Available-for-sale marketable securities:        
Total fair value of available-for-sale marketable securities 627,982,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
  704,536,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Convertible Debt [Abstract]        
Fair value of the outstanding notes 876,000,000us-gaap_ConvertibleDebtFairValueDisclosures
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
  819,800,000us-gaap_ConvertibleDebtFairValueDisclosures
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Restricted [Member] | Measured on a recurring basis        
Available-for-sale marketable securities:        
Equity securities     91,439,000us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ regn_ClassificationOfInvestmentAxis
= regn_RestrictedMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Restricted [Member] | Measured on a recurring basis | Significant Other Observable Inputs (Level 2)        
Available-for-sale marketable securities:        
Equity securities     91,439,000us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ regn_ClassificationOfInvestmentAxis
= regn_RestrictedMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Unrestricted [Member]        
Available-for-sale marketable securities:        
Total fair value of available-for-sale marketable securities 717,562,000us-gaap_AvailableForSaleSecurities
/ regn_ClassificationOfInvestmentAxis
= regn_UnrestrictedMember
  620,476,000us-gaap_AvailableForSaleSecurities
/ regn_ClassificationOfInvestmentAxis
= regn_UnrestrictedMember
 
Unrestricted [Member] | Measured on a recurring basis        
Available-for-sale marketable securities:        
U.S. government and government agency obligations 56,634,000regn_USGovernmentObligationsFairValueDisclosure
/ regn_ClassificationOfInvestmentAxis
= regn_UnrestrictedMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
  28,553,000regn_USGovernmentObligationsFairValueDisclosure
/ regn_ClassificationOfInvestmentAxis
= regn_UnrestrictedMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Corporate bonds 531,492,000us-gaap_FinancialInstrumentsOwnedCorporateDebtAtFairValue
/ regn_ClassificationOfInvestmentAxis
= regn_UnrestrictedMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
  547,506,000us-gaap_FinancialInstrumentsOwnedCorporateDebtAtFairValue
/ regn_ClassificationOfInvestmentAxis
= regn_UnrestrictedMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Municipal bonds 39,856,000us-gaap_MunicipalDebtSecuritiesAtCarryingValue
/ regn_ClassificationOfInvestmentAxis
= regn_UnrestrictedMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
  37,038,000us-gaap_MunicipalDebtSecuritiesAtCarryingValue
/ regn_ClassificationOfInvestmentAxis
= regn_UnrestrictedMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Equity securities 89,580,000us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ regn_ClassificationOfInvestmentAxis
= regn_UnrestrictedMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
  7,379,000us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ regn_ClassificationOfInvestmentAxis
= regn_UnrestrictedMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Total fair value of available-for-sale marketable securities     620,476,000us-gaap_AvailableForSaleSecurities
/ regn_ClassificationOfInvestmentAxis
= regn_UnrestrictedMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Unrestricted [Member] | Measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)        
Available-for-sale marketable securities:        
Equity securities 89,580,000us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ regn_ClassificationOfInvestmentAxis
= regn_UnrestrictedMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
  7,379,000us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ regn_ClassificationOfInvestmentAxis
= regn_UnrestrictedMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Total fair value of available-for-sale marketable securities     7,379,000us-gaap_AvailableForSaleSecurities
/ regn_ClassificationOfInvestmentAxis
= regn_UnrestrictedMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Unrestricted [Member] | Measured on a recurring basis | Significant Other Observable Inputs (Level 2)        
Available-for-sale marketable securities:        
U.S. government and government agency obligations 56,634,000regn_USGovernmentObligationsFairValueDisclosure
/ regn_ClassificationOfInvestmentAxis
= regn_UnrestrictedMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
  28,553,000regn_USGovernmentObligationsFairValueDisclosure
/ regn_ClassificationOfInvestmentAxis
= regn_UnrestrictedMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Municipal bonds 39,856,000us-gaap_MunicipalDebtSecuritiesAtCarryingValue
/ regn_ClassificationOfInvestmentAxis
= regn_UnrestrictedMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
  37,038,000us-gaap_MunicipalDebtSecuritiesAtCarryingValue
/ regn_ClassificationOfInvestmentAxis
= regn_UnrestrictedMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Equity securities 531,492,000us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ regn_ClassificationOfInvestmentAxis
= regn_UnrestrictedMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
  547,506,000us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ regn_ClassificationOfInvestmentAxis
= regn_UnrestrictedMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Total fair value of available-for-sale marketable securities     613,097,000us-gaap_AvailableForSaleSecurities
/ regn_ClassificationOfInvestmentAxis
= regn_UnrestrictedMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Warrant Transactions [Member]        
Convertible Debt [Abstract]        
Other Liabilities, Fair Value Disclosure $ 0us-gaap_OtherLiabilitiesFairValueDisclosure
/ us-gaap_ClassOfWarrantOrRightAxis
= regn_WarrantTransactionsMember
$ 0us-gaap_OtherLiabilitiesFairValueDisclosure
/ us-gaap_ClassOfWarrantOrRightAxis
= regn_WarrantTransactionsMember
$ 87,500,000us-gaap_OtherLiabilitiesFairValueDisclosure
/ us-gaap_ClassOfWarrantOrRightAxis
= regn_WarrantTransactionsMember
$ 0us-gaap_OtherLiabilitiesFairValueDisclosure
/ us-gaap_ClassOfWarrantOrRightAxis
= regn_WarrantTransactionsMember