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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014 | Dec. 31, 2013
Fair value amounts included in the carrying value of |  |  |  |
Cash and cash equivalents | $ 362,787 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 370,323 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 312,020 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 211,349 us-gaap_CashAndCashEquivalentsAtCarryingValue
Short-term investments | 647,284 us-gaap_ShortTermInvestments | 781,134 us-gaap_ShortTermInvestments |  |
Investments | 41,240 us-gaap_LongTermInvestments | 42,940 us-gaap_LongTermInvestments |  |
Asset transfers between Level 1 and Level 2 measurements | 0 mnst_FairValueAssetTransfersBetweenLevel1AndLevel2 | 0 mnst_FairValueAssetTransfersBetweenLevel1AndLevel2 |  |
Level 1 |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |
Cash and cash equivalents | 359,992 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueInputsLevel1Member | 303,018 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueInputsLevel1Member |  |
Total | 359,992 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueInputsLevel1Member | 303,018 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueInputsLevel1Member |  |
Level 2 |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |
Cash and cash equivalents | 2,795 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueInputsLevel2Member | 67,305 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueInputsLevel2Member |  |
Short-term investments | 643,374 us-gaap_ShortTermInvestments / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueInputsLevel2Member | 777,224 us-gaap_ShortTermInvestments / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueInputsLevel2Member |  |
Accounts receivable, net | 393 us-gaap_AccountsReceivableFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueInputsLevel2Member | 83 us-gaap_AccountsReceivableFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueInputsLevel2Member |  |
Investments | 41,240 us-gaap_LongTermInvestments / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueInputsLevel2Member | 42,940 us-gaap_LongTermInvestments / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueInputsLevel2Member |  |
Accrued liabilities | (177)us-gaap_AccruedLiabilitiesFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueInputsLevel2Member | (335)us-gaap_AccruedLiabilitiesFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueInputsLevel2Member |  |
Total | 687,625 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueInputsLevel2Member | 887,217 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueInputsLevel2Member |  |
Level 3 |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |
Short-term investments | 3,910 us-gaap_ShortTermInvestments / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueInputsLevel3Member | 3,910 us-gaap_ShortTermInvestments / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueInputsLevel3Member |  |
Prepaid expenses and other current assets | 250 mnst_PrepaidExpenseAndOtherCurrentAssetsFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueInputsLevel3Member | 250 mnst_PrepaidExpenseAndOtherCurrentAssetsFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueInputsLevel3Member |  |
Total | 4,160 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueInputsLevel3Member | 4,160 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueInputsLevel3Member |  |
Total fair value |  |  |  |
Fair value amounts included in the carrying value of |  |  |  |
Cash and cash equivalents | 362,787 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 370,323 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |
Short-term investments | 647,284 us-gaap_ShortTermInvestments / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 781,134 us-gaap_ShortTermInvestments / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |
Accounts receivable, net | 393 us-gaap_AccountsReceivableFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 83 us-gaap_AccountsReceivableFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |
Investments | 41,240 us-gaap_LongTermInvestments / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 42,940 us-gaap_LongTermInvestments / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |
Prepaid expenses and other current assets | 250 mnst_PrepaidExpenseAndOtherCurrentAssetsFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 250 mnst_PrepaidExpenseAndOtherCurrentAssetsFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |
Accrued liabilities | (177)us-gaap_AccruedLiabilitiesFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | (335)us-gaap_AccruedLiabilitiesFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |
Total | $ 1,051,777 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | $ 1,194,395 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |

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- Definition Represents the portion of the balance sheet assertion valued at fair value by the entity, whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with fair value disclosures required in footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure, in the same submission. It represents the fair value of assets categorized as prepaid expenses and other current assets. + References No definition available. + Details
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- Definition Fair value portion of amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13487-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 3 -Subparagraph a, b -Article 5 + Details
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- Definition Fair value portion of accrued expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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 Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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- Definition The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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