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COMMITMENTS AND CONTINGENCIES - Litigation (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) product
Commitments and contingencies
Accrued loss contingencies | $	$ 60
TCCC
Commitments and contingencies
Number of energy products developed | product	3

X

- Definition

Number of energy products developed that it believes it may market under the exception.

+ References

No definition available.

+ Details

Name:	mnst_NumberOfEnergyProductsDeveloped
Namespace Prefix:	mnst_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_LossContingenciesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349

+ Details

Name:	us-gaap_LossContingencyAccrualAtCarryingValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=mnst_CocaColaCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: