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Fair Value Measurements - Fair Value Inputs, Liabilities, Quantitative Information (Details) (Contingent Consideration, USD $) In Thousands, unless otherwise specified | 3 Months Ended |  |  |
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Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014 | Dec. 31, 2013
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |
Contingent consideration liability | 1,842 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue | $ 1,886 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue | $ 2,513 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue | $ 2,526 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Revenue-based Payments |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |
Contingent consideration liability | 1,697 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_ContingentConsiderationByTypeAxis = mmsi_RevenueBasedPaymentsMember / us-gaap_FairValueByLiabilityClassAxis = mmsi_ContingentConsiderationMember |  |  |
Revenue-based Payments | Income Approach Valuation Technique | Fair Value, Inputs, Level 3 |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |
Probability of milestone payment | 90.00%mmsi_FairValueInputsProbabilityOfMilestonePayment / us-gaap_ContingentConsiderationByTypeAxis = mmsi_RevenueBasedPaymentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByLiabilityClassAxis = mmsi_ContingentConsiderationMember / us-gaap_ValuationTechniqueAxis = us-gaap_IncomeApproachValuationTechniqueMember |  |  |
Revenue-based Payments | Minimum | Income Approach Valuation Technique | Fair Value, Inputs, Level 3 |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |
Discount rate | 1.00%us-gaap_FairValueInputsDiscountRate / us-gaap_ContingentConsiderationByTypeAxis = mmsi_RevenueBasedPaymentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByLiabilityClassAxis = mmsi_ContingentConsiderationMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = us-gaap_IncomeApproachValuationTechniqueMember |  |  |
Revenue-based Payments | Maximum | Income Approach Valuation Technique | Fair Value, Inputs, Level 3 |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |
Discount rate | 14.00%us-gaap_FairValueInputsDiscountRate / us-gaap_ContingentConsiderationByTypeAxis = mmsi_RevenueBasedPaymentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByLiabilityClassAxis = mmsi_ContingentConsiderationMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = us-gaap_IncomeApproachValuationTechniqueMember |  |  |
Other Payments |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |
Contingent consideration liability | 145 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_ContingentConsiderationByTypeAxis = mmsi_OtherPaymentsMember / us-gaap_FairValueByLiabilityClassAxis = mmsi_ContingentConsiderationMember |  |  |
Other Payments | Income Approach Valuation Technique | Fair Value, Inputs, Level 3 |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |  |
Discount rate | 5.00%us-gaap_FairValueInputsDiscountRate / us-gaap_ContingentConsiderationByTypeAxis = mmsi_OtherPaymentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByLiabilityClassAxis = mmsi_ContingentConsiderationMember / us-gaap_ValuationTechniqueAxis = us-gaap_IncomeApproachValuationTechniqueMember |  |  |
Probability of milestone payment | 100.00%mmsi_FairValueInputsProbabilityOfMilestonePayment / us-gaap_ContingentConsiderationByTypeAxis = mmsi_OtherPaymentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByLiabilityClassAxis = mmsi_ContingentConsiderationMember / us-gaap_ValuationTechniqueAxis = us-gaap_IncomeApproachValuationTechniqueMember |  |  |

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- Definition Fair Value Inputs, Probability of Milestone Payment + References No definition available. + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Details
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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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