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Commitments and Contingencies (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Other Commitments [Line Items]        
Operating Leases, Rent Expense   $ 8,100,000us-gaap_LeaseAndRentalExpense $ 5,500,000us-gaap_LeaseAndRentalExpense $ 4,800,000us-gaap_LeaseAndRentalExpense
Proceeds from sale-leaseback transactions 24,000,000us-gaap_SaleLeasebackTransactionGrossProceedsInvestingActivities 5,521,000us-gaap_SaleLeasebackTransactionGrossProceedsInvestingActivities 24,000,000us-gaap_SaleLeasebackTransactionGrossProceedsInvestingActivities 0us-gaap_SaleLeasebackTransactionGrossProceedsInvestingActivities
Lessee Leasing Arrangements, Operating Leases, Term of Contract 19 years 10 months 7 years    
Irish Grants Related to Research and Development, Training and Hiring   0mmsi_GrantsRelatedtoResearchandDevelopmentTrainingandHiring 1,200,000mmsi_GrantsRelatedtoResearchandDevelopmentTrainingandHiring 424,000mmsi_GrantsRelatedtoResearchandDevelopmentTrainingandHiring
Deferred Credits and Other Liabilities 3,100,000us-gaap_DeferredCreditsAndOtherLiabilities 2,900,000us-gaap_DeferredCreditsAndOtherLiabilities 3,100,000us-gaap_DeferredCreditsAndOtherLiabilities  
Irish Grants Related to Purchased Property Plant and Equipment   175,000mmsi_IrishGrantsRelatedToPurchasedPropertyPlantAndEquipment 139,000mmsi_IrishGrantsRelatedToPurchasedPropertyPlantAndEquipment 174,000mmsi_IrishGrantsRelatedToPurchasedPropertyPlantAndEquipment
Refundable Irish Grants if Operations Cease   $ 4,400,000mmsi_RefundableIrishGrantsIfOperationsCease    
Remaining grant liability period   4 years    
Minimum        
Other Commitments [Line Items]        
Grant liability period   5 years    
Maximum        
Other Commitments [Line Items]        
Grant liability period   8 years