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INVESTMENTS (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012 D	Dec. 31, 2011
INVESTMENTS
Number of days for settlement basis, VRDNs to be liquidated at par	7
Disclosure of underlying contractual maturities of investments
Amortized Cost	$ 441,452	$ 434,476
Fair Value	441,362	434,420
U.S. Treasuries | Less than 1 year
Disclosure of underlying contractual maturities of investments
Amortized Cost	402	8,034
Fair Value	402	8,039
Certificates of deposit | Less than 1 year
Disclosure of underlying contractual maturities of investments
Amortized Cost	37,594	29,034
Fair Value	37,594	29,035
Corporate bonds | Less than 1 year
Disclosure of underlying contractual maturities of investments
Amortized Cost		2,022
Fair Value		2,022
Municipal securities | Less than 1 year
Disclosure of underlying contractual maturities of investments
Amortized Cost	330,546	284,605
Fair Value	330,457	284,541
U.S. government agency securities | Less than 1 year
Disclosure of underlying contractual maturities of investments
Amortized Cost	19,988	16,005
Fair Value	19,987	16,007
Variable rate demand notes | Due 1 - 10 years
Disclosure of underlying contractual maturities of investments
Amortized Cost		5,775
Fair Value		5,775
Variable rate demand notes | Due 11 - 20 years
Disclosure of underlying contractual maturities of investments
Amortized Cost	6,801	12,716
Fair Value	6,801	12,716
Variable rate demand notes | Due 21 - 30 years
Disclosure of underlying contractual maturities of investments
Amortized Cost	18,082	27,902
Fair Value	18,082	27,902
Variable rate demand notes | Due 31 - 40 years
Disclosure of underlying contractual maturities of investments
Amortized Cost	6,175	12,532
Fair Value	6,175	12,532
Auction rate securities | Due 11 - 20 years
Disclosure of underlying contractual maturities of investments
Amortized Cost	5,350	5,158
Fair Value	5,350	5,158
Auction rate securities | Due 21 - 30 years
Disclosure of underlying contractual maturities of investments
Amortized Cost	16,514	25,134
Fair Value	16,514	25,134
Auction rate securities | Due 31 - 40 years
Disclosure of underlying contractual maturities of investments
Amortized Cost		5,559
Fair Value		$ 5,559

X

- Definition

This item represents the cost of debt and equity securities net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

No definition available.

+ Details

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Namespace Prefix:	mnst_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the number of days for settlement basis, on which investment securities will be liquidated at par.

+ References

No definition available.

+ Details

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

X

- Details

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

X

- Details

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

X

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Available-for-Sale Securities

-URI http://asc.fasb.org/extlink&oid=6505594



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6379932&loc=d3e22054-111558



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 13

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Trading Securities

-URI http://asc.fasb.org/extlink&oid=6526789



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 12

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 7

-Section 03

-Paragraph 1

-Subparagraph a, f, g



Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 35

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6956420&loc=d3e24584-111560

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant