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INTANGIBLES, Net (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Intangibles, Net      
Amortizing intangibles $ 233,000us-gaap_FiniteLivedIntangibleAssetsGross $ 1,076,000us-gaap_FiniteLivedIntangibleAssetsGross  
Accumulated amortization (50,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization (590,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization  
Amortizing intangibles, net 183,000us-gaap_FiniteLivedIntangibleAssetsNet 486,000us-gaap_FiniteLivedIntangibleAssetsNet  
Non-amortizing intangibles 50,565,000us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill 65,288,000us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill  
Intangible, net 50,748,000us-gaap_IntangibleAssetsNetExcludingGoodwill 65,774,000us-gaap_IntangibleAssetsNetExcludingGoodwill  
Weighted-average useful life 17 years    
Amortization expense 400,000us-gaap_AmortizationOfIntangibleAssets 50,000us-gaap_AmortizationOfIntangibleAssets 50,000us-gaap_AmortizationOfIntangibleAssets
Future estimated amortization expense related to amortizing intangibles $ 10,000mnst_FiniteLivedIntangibleAssetsFutureAmortizationExpensePerYearForNextFiveYears    
Minimum      
Intangibles, Net      
Weighted-average useful life 1 year    
Maximum      
Intangibles, Net      
Weighted-average useful life 25 years