FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details 3) (Discounted cash flow, Level 3, Assets at fair value on recurring basis)	12 Months Ended
Dec. 31, 2014
Auction Rate Securities: Trading \| Minimum
Quantitative information related to the significant unobservable inputs
Maximum rate probability (as a percent)	1.37%
Principal returned probability (as a percent)	84.78%
Default probability (as a percent)	4.56%
Liquidity risk (as a percent)	2.50%
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)	3.02%
Principal returned probability (as a percent)	94.07%
Default probability (as a percent)	12.21%
Liquidity risk (as a percent)	2.50%
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)	2.58%
Principal returned probability (as a percent)	87.05%
Default probability (as a percent)	10.37%
Liquidity risk (as a percent)	2.50%
Recovery rate (as a percent)	60.00%
Put options \| Minimum
Quantitative information related to the significant unobservable inputs
Counterparty risk (as a percent)	0.73%
Put options \| Maximum
Quantitative information related to the significant unobservable inputs
Counterparty risk (as a percent)	0.79%
Put options \| Weighted Average
Quantitative information related to the significant unobservable inputs
Counterparty risk (as a percent)	0.74%

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

No definition available.

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- Definition

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

+ References

No definition available.

+ Details

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- 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_
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- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	mnst_
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- Details

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- 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
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- Definition

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

+ References

+ Details

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- Details

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- Details

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