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Net Income (Loss) 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
Earnings Per Share [Abstract]                      
Net income $ 110,176us-gaap_NetIncomeLoss [1] $ 79,720us-gaap_NetIncomeLoss [1] $ 92,735us-gaap_NetIncomeLoss [1] $ 65,443us-gaap_NetIncomeLoss [1] $ 96,806us-gaap_NetIncomeLoss $ 141,306us-gaap_NetIncomeLoss $ 87,376us-gaap_NetIncomeLoss $ 98,874us-gaap_NetIncomeLoss $ 348,074us-gaap_NetIncomeLoss $ 424,362us-gaap_NetIncomeLoss $ 750,269us-gaap_NetIncomeLoss
Effect of dilutive securities:                      
Convertible senior notes - interest expense related to contractual coupon interest rate and amortization of discount and note issuance costs                 0us-gaap_InterestOnConvertibleDebtNetOfTax 0us-gaap_InterestOnConvertibleDebtNetOfTax 29,126us-gaap_InterestOnConvertibleDebtNetOfTax
Net income (loss) - diluted                 $ 348,074us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ 424,362us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ 779,395us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]                      
Weighted average shares outstanding - basic                 100,612us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 97,917us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 94,685us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities (in shares):                      
Stock options                 9,440us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 10,233us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 14,231us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Restricted stock                 425regn_IncrementalCommonSharesAttributableToNonvestedRestrictedShares 433regn_IncrementalCommonSharesAttributableToNonvestedRestrictedShares 715regn_IncrementalCommonSharesAttributableToNonvestedRestrictedShares
Convertible senior notes                 0us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities 0us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities 4,761us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities
Warrants                 2,936us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants 2,707us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants 990us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants
Dilutive potential shares                 12,801us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 13,373us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 20,697us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Weighted average shares - diluted (in shares)                 113,413us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 111,290us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 115,382us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings Per Share, Basic and Diluted [Abstract]                      
Net income per share - basic $ 1.09us-gaap_EarningsPerShareBasic $ 0.79us-gaap_EarningsPerShareBasic $ 0.92us-gaap_EarningsPerShareBasic $ 0.66us-gaap_EarningsPerShareBasic $ 0.98us-gaap_EarningsPerShareBasic $ 1.44us-gaap_EarningsPerShareBasic $ 0.89us-gaap_EarningsPerShareBasic $ 1.02us-gaap_EarningsPerShareBasic $ 3.46us-gaap_EarningsPerShareBasic $ 4.33us-gaap_EarningsPerShareBasic $ 7.92us-gaap_EarningsPerShareBasic
Net income per share - diluted (in dollars per share) $ 0.96us-gaap_EarningsPerShareDiluted $ 0.70us-gaap_EarningsPerShareDiluted $ 0.82us-gaap_EarningsPerShareDiluted $ 0.58us-gaap_EarningsPerShareDiluted $ 0.86us-gaap_EarningsPerShareDiluted $ 1.25us-gaap_EarningsPerShareDiluted $ 0.79us-gaap_EarningsPerShareDiluted $ 0.90us-gaap_EarningsPerShareDiluted $ 3.07us-gaap_EarningsPerShareDiluted $ 3.81us-gaap_EarningsPerShareDiluted $ 6.75us-gaap_EarningsPerShareDiluted
Stock options                      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Weighted average number of shares                 1,470us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember		 304us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember		 325us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember
Convertible senior notes                      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Weighted average number of shares                 4,247us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_ConvertibleDebtSecuritiesMember		 4,761us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_ConvertibleDebtSecuritiesMember		 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_ConvertibleDebtSecuritiesMember
[1] Net income in the third quarter of 2014 included a $40.6 million incremental charge related to the Branded Prescription Drug Fee based on final regulations issued by the IRS in July 2014 as described in Note 3 above.