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INVESTMENTS (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Held to Maturity and Available-for-sale
Held to maturity and available-for-sale securities, Amortized Cost	$ 820,164mnst_HeldToMaturityAndAvailableForSaleSecuritiesAmortizedCost	$ 395,855mnst_HeldToMaturityAndAvailableForSaleSecuritiesAmortizedCost
Held to maturity and available-for-sale securities, Gross Unrealized Holding Gains	112mnst_HeldToMaturityAndAvailableForSaleSecuritiesGrossUnrealizedGain	48mnst_HeldToMaturityAndAvailableForSaleSecuritiesGrossUnrealizedGain
Held to maturity and available-for-sale securities, Fair Value	820,276mnst_HeldToMaturityAndAvailableForSaleSecuritiesFairValueDisclosure	395,903mnst_HeldToMaturityAndAvailableForSaleSecuritiesFairValueDisclosure
Held to Maturity, Available-for-sale, and Trading
Total Fair Value	824,186us-gaap_InvestmentsFairValueDisclosure	412,087us-gaap_InvestmentsFairValueDisclosure
Short-term | Certificates of deposit
Held-to-Maturity
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment		22,045us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CertificatesOfDepositMember
Fair Value		22,045us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CertificatesOfDepositMember
Short-term | Commercial paper
Held-to-Maturity
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	19,482us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialPaperMember	5,991us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialPaperMember
Gross Unrealized Holding Gains	(2)us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialPaperMember
Fair Value	19,480us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialPaperMember	5,991us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialPaperMember
Short-term | Municipal securities
Held-to-Maturity
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	744,542us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember	367,819us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember
Gross Unrealized Holding Gains	105us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember	48us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember
Fair Value	744,647us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember	367,867us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember
Short-term | U.S. government Agencies
Held-to-Maturity
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	9,199us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Gross Unrealized Holding Gains	(1)us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Fair Value	9,198us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Short-term | Variable rate demand notes
Available-for-sale
Amortized Cost	4,001us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_VariableRateDemandObligationMember
Fair Value	4,001us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_VariableRateDemandObligationMember
Short-term | Auction rate securities
Trading
Fair Value	3,910us-gaap_TradingSecurities / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember	6,392us-gaap_TradingSecurities / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember
Long-term | Municipal securities
Held-to-Maturity
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	42,940us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_InvestmentTypeAxis = mnst_LongTermInvestmentsMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember
Gross Unrealized Holding Gains	10us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain / us-gaap_InvestmentTypeAxis = mnst_LongTermInvestmentsMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember
Fair Value	42,950us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_InvestmentTypeAxis = mnst_LongTermInvestmentsMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember
Long-term | Auction rate securities
Trading
Fair Value		$ 9,792us-gaap_TradingSecurities / us-gaap_InvestmentTypeAxis = mnst_LongTermInvestmentsMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember

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Represents investments in debt securities which are categorized as held-to-maturity and available-for-sale; such investments are normally measured at amortized cost (carrying value) unless circumstances indicate that the value to be recovered from the investment is less than its carried amount. This element may be used in connection with the fair value disclosures required in footnote disclosures to the financial statements.

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