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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 |  | $ 1,400,000 us-gaap_OtherAssetImpairmentCharges | $ 8,200,000 us-gaap_OtherAssetImpairmentCharges | $ 55,000 us-gaap_OtherAssetImpairmentCharges |
Goodwill impairment charge |  | 1,100,000 us-gaap_GoodwillImpairmentLoss |  |  |
Impairment of cost-method investment | 2,368,000 us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment | 0 us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment | 0 us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment | 2,368,000 us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment |
Other Long-term Obligations |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Contingent consideration liability |  | 803,000 mmsi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedContingentLiabilityNoncurrent / us-gaap_BalanceSheetLocationAxis = mmsi_OtherLongTermObligationsMember | 2,300,000 mmsi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedContingentLiabilityNoncurrent / us-gaap_BalanceSheetLocationAxis = mmsi_OtherLongTermObligationsMember |  |
Accrued Liabilities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Contingent consideration liability |  | 1,100,000 mmsi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedContingentLiabilityCurrent / us-gaap_BalanceSheetLocationAxis = us-gaap_AccruedLiabilitiesMember | 274,000 mmsi_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 |  |  |  |  | $ 447,000 us-gaap_FiniteLivedIntangibleAssetsFairValueDisclosure / us-gaap_BusinessAcquisitionAxis = mmsi_OstialSolutionsLlcMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember

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- Definition This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the cost method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596 + Details
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- Definition Fair value portion of assets, excluding financial assets, that lack physical substance, having a limited useful life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258 + Details
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