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Income Taxes - Narrative (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Tax Disclosure [Abstract] |  |  |
Valuation Allowance, Deferred Tax Asset, Change in Amount | $ 240,000 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | $ 138,000 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | $ 864,000 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
U.S federal net operating loss carryforwards | 38,700,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic | 52,200,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic |
Net Operating Loss Carryforwards Utilization | 12 years |  |
Net Operating Loss Carryforwards Used In The Current Period | 13,500,000 mmsi_NetOperatingLossCarryforwardsUsedInCurrentPeriod | 3,800,000 mmsi_NetOperatingLossCarryforwardsUsedInCurrentPeriod |
non-U.S. net operating loss carryforwards | 53,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign | 125,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign |
Unrecognized Tax Benefits Gross Including Interest and Penalties |  | 1,900,000 mmsi_UnrecognizedTaxBenefitsGrossIncludingInterestAndPenalties | 2,300,000 mmsi_UnrecognizedTaxBenefitsGrossIncludingInterestAndPenalties
Unrecognized Tax Benefits that Would Impact Effective Tax Rate |  | 1,600,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | 1,700,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Gross increases in tax positions taken in the current year | 309,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions | 236,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions | 260,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Deferred Tax Asset, Reduction in Valuation Allowance, Noncurrent | 563,000 mmsi_DeferredTaxAssetReductioninValuationAllowanceNoncurrent |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | 181,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | 139,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense | 42,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense | 22,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense | 215,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense
Estimated change in unrecognized tax benefit in next twelve months, lower bound | 400,000 us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeLowerBound |  |
Estimated change in unrecognized tax benefit in next twelve months, upper bound | $ 800,000 us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeUpperBound |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate

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- Definition The gross amount of unrecognized tax benefits (tax reductions recognized in financial reports but excluded from tax returns) pertaining to uncertain tax positions taken in tax returns as of the balance sheet date including Interest and Penalties. + References No definition available. + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount of (increase) decrease reasonably possible in the estimated lower bound of the unrecognized tax benefit for a tax position taken or expected to be taken. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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