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Fair Value Measurements - Narrative (Details) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Other Asset Impairment Charges   $ 1,400,000us-gaap_OtherAssetImpairmentCharges $ 8,200,000us-gaap_OtherAssetImpairmentCharges $ 55,000us-gaap_OtherAssetImpairmentCharges  
Goodwill impairment charge   1,100,000us-gaap_GoodwillImpairmentLoss      
Impairment of cost-method investment 2,368,000us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment 0us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment 0us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment 2,368,000us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment  
Other Long-term Obligations          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Contingent consideration liability   803,000mmsi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedContingentLiabilityNoncurrent
/ us-gaap_BalanceSheetLocationAxis
= mmsi_OtherLongTermObligationsMember
2,300,000mmsi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedContingentLiabilityNoncurrent
/ us-gaap_BalanceSheetLocationAxis
= mmsi_OtherLongTermObligationsMember
   
Accrued Liabilities          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Contingent consideration liability   1,100,000mmsi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedContingentLiabilityCurrent
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember
274,000mmsi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedContingentLiabilityCurrent
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember
   
Ostial Solutions, LLC | Developed technology          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Finite-lived Intangible Assets, Fair Value Disclosure         $ 447,000us-gaap_FiniteLivedIntangibleAssetsFairValueDisclosure
/ us-gaap_BusinessAcquisitionAxis
= mmsi_OstialSolutionsLlcMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember