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COMMITMENTS AND CONTINGENCIES (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Commitments and Contingencies  
Purchase Commitments $ 22.5us-gaap_LongTermPurchaseCommitmentAmount
Period over which obligations will be paid 1 year
Aggregate contractual obligations 93.3us-gaap_ContractualObligation
Aggregate operating lease commitments 11.5us-gaap_OperatingLeasesFutureMinimumPaymentsDue
Subsequent event  
Commitments and Contingencies  
Number of acres of vacant land acquired 56mnst_NumberOfAcresOfVacantLand
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Purchase price 38.1mnst_PurchaseConsideration
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Amount deposited in Escrow $ 0.5us-gaap_EscrowDepositsRelatedToPropertySales
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember