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Employee Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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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 | $ 1,800 us-gaap_DefinedContributionPlanCostRecognized | $ 429 us-gaap_DefinedContributionPlanCostRecognized | $ 1,500 us-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 | $ 912 mmsi_DefinedContributionPlanForeignCostRecognized | $ 748 mmsi_DefinedContributionPlanForeignCostRecognized | $ 724 mmsi_DefinedContributionPlanForeignCostRecognized

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- Definition The amount of the cost recognized during the period for defined contribution plans in foreing countries. + References No definition available. + Details
Name: | mmsi_DefinedContributionPlanForeignCostRecognized
Namespace Prefix: | mmsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition US Full Time Employees Minimum Years Of Age + References No definition available. + Details
Name: | mmsi_DefinedContributionPlanMinimumAgeRequirement
Namespace Prefix: | mmsi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition The Plan has a 90 day minimum service requirement + References No definition available. + Details
Name: | mmsi_DefinedContributionPlanMinimumServiceRequirement
Namespace Prefix: | mmsi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Defined Contribution Plan Percentage Maximum Foreign Employees + References No definition available. + Details
Name: | mmsi_DefinedContributionPlanPercentageMaximumForeignEmployees
Namespace Prefix: | mmsi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Defined Contribution Plan Percentage Minimum Foreign Employees + References No definition available. + Details
Name: | mmsi_DefinedContributionPlanPercentageMinimumForeignEmployees
Namespace Prefix: | mmsi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Defined Contribution Plan Percentage Minimum Foreign Management + References No definition available. + Details
Name: | mmsi_DefinedContributionPlanPercentageMinimumForeignManagement
Namespace Prefix: | mmsi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DefinedContributionPensionAndOtherPostretirementPlansDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration