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Fair Value Measurements - Narrative (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other Asset Impairment Charges | $ 14,000 us-gaap_OtherAssetImpairmentCharges | $ 34,000 us-gaap_OtherAssetImpairmentCharges |
Other Long-term Obligations |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Contingent consideration liability | 740,000 mmsi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedContingentLiabilityNoncurrent / us-gaap_BalanceSheetLocationAxis = mmsi_OtherLongTermObligationsMember |  | 803,000 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 |  | $ 1,100,000 mmsi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedContingentLiabilityCurrent / us-gaap_BalanceSheetLocationAxis = us-gaap_AccruedLiabilitiesMember

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- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Contingent Liability, Current + References No definition available. + Details
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- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Contingent Liability, Noncurrent + References No definition available. + Details
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- Definition The charge against earnings resulting from the write down of long lived assets other than goodwill due to the difference between the carrying value and lower fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 + Details
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