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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details 3) (USD $) | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Jun. 30, 2011 | Oct. 01, 2013 | Jul. 01, 2013
ARS Agreement |  |  |  |  |  |  |  |
Amortized Cost | $ 688,524,000 mnst_InvestmentSecuritiesAmortizedCostBasis | $ 824,074,000 mnst_InvestmentSecuritiesAmortizedCostBasis |  |  |  |  |  |
Auction rate securities |  |  |  |  |  |  |  |
ARS Agreement |  |  |  |  |  |  |  |
Face value of investments | 4,200,000 mnst_InvestmentsFaceAmount / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRateSecuritiesMember |  |  |  |  |  |  |
Amortized Cost | 3,900,000 mnst_InvestmentSecuritiesAmortizedCostBasis / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRateSecuritiesMember |  |  |  |  |  |  |
Trading auction rate securities, in short-term and long-term investments | 3,900,000 us-gaap_TradingSecurities / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRateSecuritiesMember |  |  |  |  |  |  |
Impairment of investments, trading securities | 300,000 mnst_ImpairmentOfInvestmentsTradingSecurities / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRateSecuritiesMember |  |  |  |  |  |  |
2011 ARS Agreement |  |  |  |  |  |  |  |
ARS Agreement |  |  |  |  |  |  |  |
Amount of securities of par value |  |  |  |  |  | 24,500,000 us-gaap_InvestmentOwnedBalancePrincipalAmount / us-gaap_InvestmentTypeAxis = mnst_AuctionRateSecurities2011Member |  |
Redemption of investment securities at par through normal market channels | 0 us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments / us-gaap_InvestmentTypeAxis = mnst_AuctionRateSecurities2011Member | 13,100,000 us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments / us-gaap_InvestmentTypeAxis = mnst_AuctionRateSecurities2011Member | 2,300,000 us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments / us-gaap_InvestmentTypeAxis = mnst_AuctionRateSecurities2011Member | 1,300,000 us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments / us-gaap_InvestmentTypeAxis = mnst_AuctionRateSecurities2011Member | 3,700,000 us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments / us-gaap_InvestmentTypeAxis = mnst_AuctionRateSecurities2011Member |  |  |
Put options | Subsequent event |  |  |  |  |  |  |  |
ARS Agreement |  |  |  |  |  |  |  |
Redemption of investment securities through the exercise of the put option | 700,000 us-gaap_OpenOptionContractsWrittenAtFairValue / us-gaap_InvestmentTypeAxis = us-gaap_PutOptionMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |
2011 Put Option |  |  |  |  |  |  |  |
ARS Agreement |  |  |  |  |  |  |  |
Fair market value of investments | 300,000 us-gaap_AssetsFairValueDisclosure / us-gaap_InvestmentTypeAxis = mnst_PutOption2011Member |  |  |  |  |  |  |
2011 Put Option | Maximum |  |  |  |  |  |  |  |
ARS Agreement |  |  |  |  |  |  |  |
Amount of securities of par value |  |  |  |  |  |  | $ 1,000,000 us-gaap_InvestmentOwnedBalancePrincipalAmount / us-gaap_InvestmentTypeAxis = mnst_PutOption2011Member / us-gaap_RangeAxis = us-gaap_MaximumMember | $ 1,000,000 us-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 No definition available. + Details
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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 probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition For investments which are quantified by principal amount, the principle balance held at close of period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-12C.Column B) -URI http://asc.fasb.org/extlink&oid=34726532&loc=d3e611225-123010 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14.Column B) -URI http://asc.fasb.org/extlink&oid=34726532&loc=d3e611322-123010 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12.Column B) -URI http://asc.fasb.org/extlink&oid=34726532&loc=d3e611133-123010 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12C -Paragraph Column B -Article 12 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph Column B -Article 12 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 14 -Paragraph Column B -Article 12 + Details
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- Definition The cash inflow associated with the sale, maturity and collection of all investments such as debt, security and so forth during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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