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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Fair value amounts included in the carrying value of        
Cash and cash equivalents $ 370,323us-gaap_CashAndCashEquivalentsAtCarryingValue $ 211,349us-gaap_CashAndCashEquivalentsAtCarryingValue $ 222,514us-gaap_CashAndCashEquivalentsAtCarryingValue $ 359,331us-gaap_CashAndCashEquivalentsAtCarryingValue
Short-term investments 781,134us-gaap_ShortTermInvestments 402,247us-gaap_ShortTermInvestments    
Investments 42,940us-gaap_LongTermInvestments 9,792us-gaap_LongTermInvestments    
Asset transfers between Level 1 and Level 2 measurements 0mnst_FairValueAssetTransfersBetweenLevel1AndLevel2 0mnst_FairValueAssetTransfersBetweenLevel1AndLevel2    
Level 1        
Fair value amounts included in the carrying value of        
Cash and cash equivalents 303,018us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueInputsLevel1Member
199,402us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueInputsLevel1Member
   
Total 303,018us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueInputsLevel1Member
199,402us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueInputsLevel1Member
   
Level 2        
Fair value amounts included in the carrying value of        
Cash and cash equivalents 67,305us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueInputsLevel2Member
11,947us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueInputsLevel2Member
   
Short-term investments 777,224us-gaap_ShortTermInvestments
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueInputsLevel2Member
395,855us-gaap_ShortTermInvestments
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueInputsLevel2Member
   
Accounts receivable, net 83us-gaap_AccountsReceivableFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueInputsLevel2Member
     
Investments 42,940us-gaap_LongTermInvestments
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueInputsLevel2Member
     
Accrued liabilities (335)us-gaap_AccruedLiabilitiesFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueInputsLevel2Member
     
Total 887,217us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueInputsLevel2Member
407,802us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueInputsLevel2Member
   
Level 3        
Fair value amounts included in the carrying value of        
Short-term investments 3,910us-gaap_ShortTermInvestments
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueInputsLevel3Member
6,392us-gaap_ShortTermInvestments
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueInputsLevel3Member
   
Investments   9,792us-gaap_LongTermInvestments
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueInputsLevel3Member
   
Prepaid expenses and other current assets 250mnst_PrepaidExpenseAndOtherCurrentAssetsFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueInputsLevel3Member
486mnst_PrepaidExpenseAndOtherCurrentAssetsFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueInputsLevel3Member
   
Other assets   606us-gaap_OtherAssetsFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueInputsLevel3Member
   
Total 4,160us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueInputsLevel3Member
17,276us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueInputsLevel3Member
   
Total fair value        
Fair value amounts included in the carrying value of        
Cash and cash equivalents 370,323us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
211,349us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Short-term investments 781,134us-gaap_ShortTermInvestments
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
402,247us-gaap_ShortTermInvestments
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Accounts receivable, net 83us-gaap_AccountsReceivableFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
     
Investments 42,940us-gaap_LongTermInvestments
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
9,792us-gaap_LongTermInvestments
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Prepaid expenses and other current assets 250mnst_PrepaidExpenseAndOtherCurrentAssetsFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
486mnst_PrepaidExpenseAndOtherCurrentAssetsFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Other assets   606us-gaap_OtherAssetsFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Accrued liabilities (335)us-gaap_AccruedLiabilitiesFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
     
Total $ 1,194,395us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
$ 624,480us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember