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Derivatives - Interest Rate Swap (Details) (USD $) | 3 Months Ended |  |
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Mar. 31, 2015 | Dec. 31, 2014 | Dec. 19, 2012
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |
Notional Amount of Interest Rate Cash Flow Hedge Derivatives |  |  | $ 150,000,000 us-gaap_DerivativeAssetNotionalAmount
Derivative, Fixed Interest Rate |  |  | 0.9825%us-gaap_DerivativeFixedInterestRate
Quarterly reduction of notional amount | 50.00%mmsi_DerivativeQuarterlyReductionofNotionalAmount |  |
Interest rate swap (liability) | (325,000)us-gaap_InterestRateCashFlowHedgeLiabilityAtFairValue |  |
Interest rate asset |  | 573,000 us-gaap_InterestRateCashFlowHedgeAssetAtFairValue |
Accumulated other comprehensive income (loss), interest rate swap, tax benefit | $ (126,000)mmsi_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesTax | $ 223,000 mmsi_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesTax |

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- Definition Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Tax + References No definition available. + Details
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Period Type: | instant

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- Definition Derivative, Quarterly Reduction of Notional Amount + References No definition available. + Details
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- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579245-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + Details
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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Data Type: | num:percentItemType
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- Details
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- Definition Fair value as of the balance sheet date of all interest rate derivative assets designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 + Details
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- Definition Fair value as of the balance sheet date of all interest rate derivative liabilities designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
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