Name:	mnst_FairValueInputsAssetsQuantitativeInformationLineItems
Namespace Prefix:	mnst_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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

No definition available.

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

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
Balance Type:	na
Period Type:	duration

Represents the market price, used as an input to measure fair value.

No definition available.

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

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

No definition available.

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

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

No definition available.

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

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

No definition available.

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

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

No definition available.

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

FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details 3) (Level 3, Assets at fair value on recurring basis)	3 Months Ended
	Mar. 31, 2012 Auction Rate Securities: Trading Minimum Discounted cash flow	Mar. 31, 2012 Auction Rate Securities: Trading Maximum Discounted cash flow	Mar. 31, 2012 Auction Rate Securities: Trading Weighted Average Discounted cash flow	Mar. 30, 2012 Auction Rate Securities: Available-for-sale Minimum Market comparable bonds	Mar. 30, 2012 Auction Rate Securities: Available-for-sale Maximum Market comparable bonds	Mar. 30, 2012 Auction Rate Securities: Available-for-sale Weighted Average Market comparable bonds	Mar. 31, 2012 Put Options Minimum Discounted cash flow	Mar. 31, 2012 Put Options Maximum Discounted cash flow	Mar. 31, 2012 Put Options Weighted Average Discounted cash flow
Quantitative information related to the significant unobservable inputs
Maximum rate probability (as a percent)	0.02%	6.68%	1.04%
Principal returned probability (as a percent)	81.84%	95.79%	87.93%
Default probability (as a percent)	4.08%	12.29%	11.03%
Liquidity risk (as a percent)	3.50%	3.50%	3.50%
Recovery rate (as a percent)	60.00%	80.00%	60.76%
Market price (as a percent)				51.00%	64.00%	55.00%
Counterparty risk (as a percent)							1.79%	2.50%	2.15%