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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details 4) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jun. 30, 2011	Oct. 02, 2013	Jul. 02, 2013
ARS Agreement
Amortized Cost	$ 824,074,000mnst_InvestmentSecuritiesAmortizedCostBasis	$ 412,039,000mnst_InvestmentSecuritiesAmortizedCostBasis
Auction rate securities
ARS Agreement
Face value of investments	4,200,000mnst_InvestmentsFaceAmount / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRateSecuritiesMember
Amortized Cost	3,900,000mnst_InvestmentSecuritiesAmortizedCostBasis / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRateSecuritiesMember
Trading auction rate securities, in short-term and long-term investments	3,900,000us-gaap_TradingSecurities / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRateSecuritiesMember
Impairment of investments, trading securities	300,000mnst_ImpairmentOfInvestmentsTradingSecurities / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRateSecuritiesMember
2011 ARS Agreement
ARS Agreement
Amount of securities of par value					24,500,000us-gaap_InvestmentOwnedBalancePrincipalAmount / us-gaap_InvestmentTypeAxis = mnst_AuctionRateSecurities2011Member
Redemption of investment securities at par through normal market channels	6,900,000us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments / us-gaap_InvestmentTypeAxis = mnst_AuctionRateSecurities2011Member	2,300,000us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments / us-gaap_InvestmentTypeAxis = mnst_AuctionRateSecurities2011Member	1,300,000us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments / us-gaap_InvestmentTypeAxis = mnst_AuctionRateSecurities2011Member	3,700,000us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments / us-gaap_InvestmentTypeAxis = mnst_AuctionRateSecurities2011Member
Put options
ARS Agreement
Redemption of investment securities through the exercise of the put option	6,200,000us-gaap_OpenOptionContractsWrittenAtFairValue / us-gaap_InvestmentTypeAxis = us-gaap_PutOptionMember
2011 Put Option
ARS Agreement
Fair market value of investments	300,000us-gaap_AssetsFairValueDisclosure / us-gaap_InvestmentTypeAxis = mnst_PutOption2011Member
Resulted (loss) gain on revaluation of investment securities included in other income (expense)	(40,000)mnst_InvestmentSecuritiesGainOrLossOnRevaluationIncludedInOtherIncome / us-gaap_InvestmentTypeAxis = mnst_PutOption2011Member	2,700,000mnst_InvestmentSecuritiesGainOrLossOnRevaluationIncludedInOtherIncome / us-gaap_InvestmentTypeAxis = mnst_PutOption2011Member
2011 Put Option | Maximum
ARS Agreement
Amount of securities of par value						$ 1,000,000us-gaap_InvestmentOwnedBalancePrincipalAmount / us-gaap_InvestmentTypeAxis = mnst_PutOption2011Member / us-gaap_RangeAxis = us-gaap_MaximumMember	$ 1,000,000us-gaap_InvestmentOwnedBalancePrincipalAmount / us-gaap_InvestmentTypeAxis = mnst_PutOption2011Member / us-gaap_RangeAxis = us-gaap_MaximumMember

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- Definition

Represents the impairment of trading securities. This includes both temporary and other than temporary impairment.

+ References

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This item represents the cost of debt and equity securities net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

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Represents the gain (loss) recognized during the period in connection with revaluation, redemption at par and through the exercise of the put options and redemption at par of a previously other-than-temporary impaired security.

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No definition available.

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The stated face value of investments at time of payment, which may vary from the carrying amount because of unamortized premium or discount.

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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For investments which are quantified by principal amount, the principle balance held at close of period.

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The fair value of the open option contracts written for the investment.

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The cash inflow associated with the sale, maturity and collection of all investments such as debt, security and so forth during the period.

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Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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