FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details 3) (Discounted cash flow, Level 3, Assets at fair value on recurring basis)	9 Months Ended
Sep. 30, 2014
Auction Rate Securities: Trading \| Minimum
Quantitative information related to the significant unobservable inputs
Maximum rate probability (as a percent)	0.70%
Principal returned probability (as a percent)	85.10%
Default probability (as a percent)	4.46%
Liquidity risk (as a percent)	3.00%
Recovery rate (as a percent)	60.00%
Auction Rate Securities: Trading \| Maximum
Quantitative information related to the significant unobservable inputs
Maximum rate probability (as a percent)	2.81%
Principal returned probability (as a percent)	94.30%
Default probability (as a percent)	12.36%
Liquidity risk (as a percent)	3.00%
Recovery rate (as a percent)	60.00%
Auction Rate Securities: Trading \| Weighted Average
Quantitative information related to the significant unobservable inputs
Maximum rate probability (as a percent)	2.33%
Principal returned probability (as a percent)	87.03%
Default probability (as a percent)	10.64%
Liquidity risk (as a percent)	3.00%
Recovery rate (as a percent)	60.00%
Put Options \| Minimum
Quantitative information related to the significant unobservable inputs
Counterparty risk (as a percent)	0.43%
Put Options \| Maximum
Quantitative information related to the significant unobservable inputs
Counterparty risk (as a percent)	0.54%
Put Options \| Weighted Average
Quantitative information related to the significant unobservable inputs
Counterparty risk (as a percent)	0.46%

Represents the liquidity risk, used as an input to measure fair value.

No definition available.

Name:	mnst_FairValueInputsLiquidityRisk
Namespace Prefix:	mnst_
Data Type:	num:percentItemType
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Period Type:	duration

- Definition

Represents maximum rate probability expressed as a percentage, used as an input to measure fair value.

+ References

No definition available.

+ Details

Name:	mnst_FairValueInputsMaximumRateProbability
Namespace Prefix:	mnst_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of likelihood the principal will be returned, used as an input to measure fair value.

+ References

No definition available.

+ Details

Name:	mnst_FairValueInputsPrincipalReturnedProbability
Namespace Prefix:	mnst_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the risk associated with recovery, used as an input to measure fair value.

+ References

No definition available.

+ Details

Name:	mnst_FairValueInputsRecoveryRate
Namespace Prefix:	mnst_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

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

- Definition

Risk that one party to the contract will default expressed as a percentage, used as an input to measure fair value.

+ 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 (bbb)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueInputsCounterpartyCreditRisk
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of likelihood a loan will not be repaid and instead default, used as an input to measure fair value.

+ References

+ Details

Name:	us-gaap_FairValueInputsProbabilityOfDefault
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration