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Employee Benefit Plans (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]      
Minimum Years Of Age 18 years    
Minimum Service Requirement 90 days    
Defined Contribution Plan, Cost Recognized $ 1,800us-gaap_DefinedContributionPlanCostRecognized $ 429us-gaap_DefinedContributionPlanCostRecognized $ 1,500us-gaap_DefinedContributionPlanCostRecognized
Defined Contribution Plan Percentage Minimum Foreign Employees 2.00%mmsi_DefinedContributionPlanPercentageMinimumForeignEmployees    
Defined Contribution Plan Percentage Maximum Foreign Employees 32.00%mmsi_DefinedContributionPlanPercentageMaximumForeignEmployees    
Defined Contribution Plan Percentage Minimum Foreign Management 2.00%mmsi_DefinedContributionPlanPercentageMinimumForeignManagement    
Defined Contribution Plan Foreign, Cost Recognized $ 912mmsi_DefinedContributionPlanForeignCostRecognized $ 748mmsi_DefinedContributionPlanForeignCostRecognized $ 724mmsi_DefinedContributionPlanForeignCostRecognized