Document and Entity Information - shares
6 Months Ended
Jun. 30, 2019
Jul. 29, 2019
Document and Entity Information    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2019  
Entity File Number 001-18761  
Document Transition Report false  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 47-1809393  
Entity Address, Address Line One 1 Monster Way  
Entity Address, City or Town Corona  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 92879  
City Area Code 951  
Local Phone Number 739 - 6200  
Title of 12(b) Security Common Stock  
Trading Symbol MNST  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   544,879,342
Entity Central Index Key 0000865752  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2  
Amendment Flag false