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Acquisitions - Purchase Price Allocation (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Oct. 04, 2013
Jan. 31, 2012
Nov. 19, 2012
Dec. 19, 2012
Business Acquisition [Line Items]              
Goodwill $ 184,464us-gaap_Goodwill $ 184,505us-gaap_Goodwill $ 175,108us-gaap_Goodwill        
Radial Assist              
Business Acquisition [Line Items]              
Inventories       16us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= mmsi_RadialAssistMember
     
Goodwill       904us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= mmsi_RadialAssistMember
     
Total assets acquired       2,500mmsi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsIncludingGoodwill
/ us-gaap_BusinessAcquisitionAxis
= mmsi_RadialAssistMember
     
Datascope              
Business Acquisition [Line Items]              
Inventories       478us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= mmsi_DatascopeMember
     
Goodwill       8,112us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= mmsi_DatascopeMember
     
Total assets acquired       27,500mmsi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsIncludingGoodwill
/ us-gaap_BusinessAcquisitionAxis
= mmsi_DatascopeMember
     
Ostial Solutions, LLC              
Business Acquisition [Line Items]              
Goodwill         9,580us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= mmsi_OstialSolutionsLlcMember
   
Total assets acquired         20,800mmsi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsIncludingGoodwill
/ us-gaap_BusinessAcquisitionAxis
= mmsi_OstialSolutionsLlcMember
   
MediGroup              
Business Acquisition [Line Items]              
Inventories           263us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= mmsi_MedigroupMember
 
Property and equipment           79us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= mmsi_MedigroupMember
 
Goodwill           1,697us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= mmsi_MedigroupMember
 
Total assets acquired           4,439mmsi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsIncludingGoodwill
/ us-gaap_BusinessAcquisitionAxis
= mmsi_MedigroupMember
 
Thomas Medical Products, Inc              
Business Acquisition [Line Items]              
Trade receivables             6,507us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= mmsi_ThomasMedicalProductsIncMember
Inventories             5,459us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= mmsi_ThomasMedicalProductsIncMember
Prepaid expenses             340us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= mmsi_ThomasMedicalProductsIncMember
Property and equipment             2,685us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= mmsi_ThomasMedicalProductsIncMember
Goodwill             102,407us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= mmsi_ThomasMedicalProductsIncMember
Total assets acquired             167,298mmsi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsIncludingGoodwill
/ us-gaap_BusinessAcquisitionAxis
= mmsi_ThomasMedicalProductsIncMember
Accounts payable             588us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= mmsi_ThomasMedicalProductsIncMember
Accrued expenses             1,094mmsi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedExpenses
/ us-gaap_BusinessAcquisitionAxis
= mmsi_ThomasMedicalProductsIncMember
Total liabilities assumed             1,682us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= mmsi_ThomasMedicalProductsIncMember
Net assets acquired, net of cash acquired             165,616mmsi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= mmsi_ThomasMedicalProductsIncMember
Cash acquired             1,829us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= mmsi_ThomasMedicalProductsIncMember
Developed technology | Radial Assist              
Business Acquisition [Line Items]              
Intangibles       1,520us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= mmsi_RadialAssistMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
     
Developed technology | Datascope              
Business Acquisition [Line Items]              
Intangibles       18,200us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= mmsi_DatascopeMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
     
Developed technology | Ostial Solutions, LLC              
Business Acquisition [Line Items]              
Intangibles         10,500us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= mmsi_OstialSolutionsLlcMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
   
Developed technology | MediGroup              
Business Acquisition [Line Items]              
Intangibles           2,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= mmsi_MedigroupMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
 
Developed technology | Thomas Medical Products, Inc              
Business Acquisition [Line Items]              
Intangibles             43,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= mmsi_ThomasMedicalProductsIncMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
Customer lists | Radial Assist              
Business Acquisition [Line Items]              
Intangibles       20us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= mmsi_RadialAssistMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerListsMember
     
Customer lists | Datascope              
Business Acquisition [Line Items]              
Intangibles       390us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= mmsi_DatascopeMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerListsMember
     
Customer lists | Ostial Solutions, LLC              
Business Acquisition [Line Items]              
Intangibles         600us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= mmsi_OstialSolutionsLlcMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerListsMember
   
Customer lists | MediGroup              
Business Acquisition [Line Items]              
Intangibles           110us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= mmsi_MedigroupMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerListsMember
 
Customer lists | Thomas Medical Products, Inc              
Business Acquisition [Line Items]              
Intangibles             5,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= mmsi_ThomasMedicalProductsIncMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerListsMember
Trademarks | Radial Assist              
Business Acquisition [Line Items]              
Intangibles       40us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= mmsi_RadialAssistMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
     
Trademarks | Datascope              
Business Acquisition [Line Items]              
Intangibles       320us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= mmsi_DatascopeMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
     
Trademarks | Ostial Solutions, LLC              
Business Acquisition [Line Items]              
Intangibles         110us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= mmsi_OstialSolutionsLlcMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
   
Trademarks | MediGroup              
Business Acquisition [Line Items]              
Intangibles           80us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= mmsi_MedigroupMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
 
Trademarks | Thomas Medical Products, Inc              
Business Acquisition [Line Items]              
Intangibles             1,400us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= mmsi_ThomasMedicalProductsIncMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
Non-compete agreements | Ostial Solutions, LLC              
Business Acquisition [Line Items]              
Intangibles         10us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= mmsi_OstialSolutionsLlcMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
   
Non-compete agreements | MediGroup              
Business Acquisition [Line Items]              
Intangibles           210us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= mmsi_MedigroupMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
 
Non-compete agreements | Thomas Medical Products, Inc              
Business Acquisition [Line Items]              
Intangibles             $ 500us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= mmsi_ThomasMedicalProductsIncMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember