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INVESTMENTS (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Investments
Amortized Cost	$ 688,524mnst_InvestmentSecuritiesAmortizedCostBasis	$ 824,074mnst_InvestmentSecuritiesAmortizedCostBasis
Fair Value	688,572us-gaap_InvestmentsFairValueDisclosure	824,186us-gaap_InvestmentsFairValueDisclosure
Commercial paper | Less than 1 year
Investments
Amortized Cost	15,991mnst_InvestmentSecuritiesAmortizedCostBasis / mnst_InvestmentHoldingsByMaturityPeriodAxis = mnst_InvestmentsMaturitiesWithin1YearMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialPaperMember	19,482mnst_InvestmentSecuritiesAmortizedCostBasis / mnst_InvestmentHoldingsByMaturityPeriodAxis = mnst_InvestmentsMaturitiesWithin1YearMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialPaperMember
Fair Value	15,990us-gaap_InvestmentsFairValueDisclosure / mnst_InvestmentHoldingsByMaturityPeriodAxis = mnst_InvestmentsMaturitiesWithin1YearMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialPaperMember	19,480us-gaap_InvestmentsFairValueDisclosure / mnst_InvestmentHoldingsByMaturityPeriodAxis = mnst_InvestmentsMaturitiesWithin1YearMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialPaperMember
Municipal securities | Less than 1 year
Investments
Amortized Cost	622,082mnst_InvestmentSecuritiesAmortizedCostBasis / mnst_InvestmentHoldingsByMaturityPeriodAxis = mnst_InvestmentsMaturitiesWithin1YearMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember	744,542mnst_InvestmentSecuritiesAmortizedCostBasis / mnst_InvestmentHoldingsByMaturityPeriodAxis = mnst_InvestmentsMaturitiesWithin1YearMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember
Fair Value	622,130us-gaap_InvestmentsFairValueDisclosure / mnst_InvestmentHoldingsByMaturityPeriodAxis = mnst_InvestmentsMaturitiesWithin1YearMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember	744,647us-gaap_InvestmentsFairValueDisclosure / mnst_InvestmentHoldingsByMaturityPeriodAxis = mnst_InvestmentsMaturitiesWithin1YearMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember
Municipal securities | Due 1 - 10 years
Investments
Amortized Cost	33,662mnst_InvestmentSecuritiesAmortizedCostBasis / mnst_InvestmentHoldingsByMaturityPeriodAxis = mnst_InvestmentsMaturitiesAfter1YearThrough10YearsMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember	42,940mnst_InvestmentSecuritiesAmortizedCostBasis / mnst_InvestmentHoldingsByMaturityPeriodAxis = mnst_InvestmentsMaturitiesAfter1YearThrough10YearsMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember
Fair Value	33,670us-gaap_InvestmentsFairValueDisclosure / mnst_InvestmentHoldingsByMaturityPeriodAxis = mnst_InvestmentsMaturitiesAfter1YearThrough10YearsMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember	42,950us-gaap_InvestmentsFairValueDisclosure / mnst_InvestmentHoldingsByMaturityPeriodAxis = mnst_InvestmentsMaturitiesAfter1YearThrough10YearsMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember
U.S. government Agencies | Less than 1 year
Investments
Amortized Cost	1,401mnst_InvestmentSecuritiesAmortizedCostBasis / mnst_InvestmentHoldingsByMaturityPeriodAxis = mnst_InvestmentsMaturitiesWithin1YearMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember	9,199mnst_InvestmentSecuritiesAmortizedCostBasis / mnst_InvestmentHoldingsByMaturityPeriodAxis = mnst_InvestmentsMaturitiesWithin1YearMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Fair Value	1,401us-gaap_InvestmentsFairValueDisclosure / mnst_InvestmentHoldingsByMaturityPeriodAxis = mnst_InvestmentsMaturitiesWithin1YearMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember	9,198us-gaap_InvestmentsFairValueDisclosure / mnst_InvestmentHoldingsByMaturityPeriodAxis = mnst_InvestmentsMaturitiesWithin1YearMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
U.S. government Agencies | Due 1 - 10 years
Investments
Amortized Cost	7,578mnst_InvestmentSecuritiesAmortizedCostBasis / mnst_InvestmentHoldingsByMaturityPeriodAxis = mnst_InvestmentsMaturitiesAfter1YearThrough10YearsMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Fair Value	7,571us-gaap_InvestmentsFairValueDisclosure / mnst_InvestmentHoldingsByMaturityPeriodAxis = mnst_InvestmentsMaturitiesAfter1YearThrough10YearsMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Variable rate demand notes | Due 21 - 30 years
Investments
Amortized Cost	3,900mnst_InvestmentSecuritiesAmortizedCostBasis / mnst_InvestmentHoldingsByMaturityPeriodAxis = mnst_InvestmentsMaturitiesAfter20YearsThrough30YearsMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_VariableRateDemandObligationMember	4,001mnst_InvestmentSecuritiesAmortizedCostBasis / mnst_InvestmentHoldingsByMaturityPeriodAxis = mnst_InvestmentsMaturitiesAfter20YearsThrough30YearsMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_VariableRateDemandObligationMember
Fair Value	3,900us-gaap_InvestmentsFairValueDisclosure / mnst_InvestmentHoldingsByMaturityPeriodAxis = mnst_InvestmentsMaturitiesAfter20YearsThrough30YearsMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_VariableRateDemandObligationMember	4,001us-gaap_InvestmentsFairValueDisclosure / mnst_InvestmentHoldingsByMaturityPeriodAxis = mnst_InvestmentsMaturitiesAfter20YearsThrough30YearsMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_VariableRateDemandObligationMember
Auction rate securities | Due 11 - 20 years
Investments
Amortized Cost	3,910mnst_InvestmentSecuritiesAmortizedCostBasis / mnst_InvestmentHoldingsByMaturityPeriodAxis = mnst_InvestmentsMaturitiesAfter10YearsThrough20YearsMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember	3,910mnst_InvestmentSecuritiesAmortizedCostBasis / mnst_InvestmentHoldingsByMaturityPeriodAxis = mnst_InvestmentsMaturitiesAfter10YearsThrough20YearsMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember
Fair Value	$ 3,910us-gaap_InvestmentsFairValueDisclosure / mnst_InvestmentHoldingsByMaturityPeriodAxis = mnst_InvestmentsMaturitiesAfter10YearsThrough20YearsMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember	$ 3,910us-gaap_InvestmentsFairValueDisclosure / mnst_InvestmentHoldingsByMaturityPeriodAxis = mnst_InvestmentsMaturitiesAfter10YearsThrough20YearsMember / mnst_ScheduleOfInvestmentHoldingsMajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember

X

- Definition

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

No definition available.

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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Available-for-Sale Securities

-URI http://asc.fasb.org/extlink&oid=6505594



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Trading Securities

-URI http://asc.fasb.org/extlink&oid=6526789



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Subparagraph a, f, g

-Article 7



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 35

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560

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