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EMPLOYEE BENEFIT PLAN (Details) (Employee 401(k) Plan, USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Defined Contribution Plan      
Employer matching contribution as a percentage of the employee's contribution 25.00%mnst_DefinedContributionPlanEmployerMatchingContributionAsPercentageOfEmployeesContribution    
Percentage of contribution vested each year 20.00%us-gaap_DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage    
Vesting period of contribution by the company 5 years    
Matching contributions by the company (in dollars) $ 0.6us-gaap_DefinedContributionPlanCostRecognized $ 0.6us-gaap_DefinedContributionPlanCostRecognized $ 0.5us-gaap_DefinedContributionPlanCostRecognized
Maximum
     
Defined Contribution Plan      
Annual employee contribution limit as a percent of compensation 15.00%mnst_DefinedContributionPlanEmployeeContributionLimitPercentOfCompensation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Percent of employee's earnings eligible for employer matching contribution 8.00%mnst_DefinedContributionPlanPercentOfEmployeeEarningsEligibleForEmployerMatchingContribution
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember