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

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- 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. + Details
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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 + Details
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