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Segment Reporting and Foreign Operations - Assets (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Assets | $ 747,165 us-gaap_Assets | $ 728,283 us-gaap_Assets | $ 705,309 us-gaap_Assets
Depreciation and amortization | 35,929 us-gaap_DepreciationDepletionAndAmortization | 32,542 us-gaap_DepreciationDepletionAndAmortization | 22,534 us-gaap_DepreciationDepletionAndAmortization
Capital expenditures | 34,181 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | 59,505 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | 64,643 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Cardiovascular Segment |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Assets | 734,940 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mmsi_CardiovascularSegmentMember | 716,659 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mmsi_CardiovascularSegmentMember | 692,689 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mmsi_CardiovascularSegmentMember
Depreciation and amortization | 34,975 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mmsi_CardiovascularSegmentMember | 31,594 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mmsi_CardiovascularSegmentMember | 21,441 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mmsi_CardiovascularSegmentMember
Capital expenditures | 33,660 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = mmsi_CardiovascularSegmentMember | 59,421 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = mmsi_CardiovascularSegmentMember | 64,059 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = mmsi_CardiovascularSegmentMember
Endoscopy Segment |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Assets | 12,225 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mmsi_EndoscopySegmentMember | 11,624 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mmsi_EndoscopySegmentMember | 12,620 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mmsi_EndoscopySegmentMember
Depreciation and amortization | 954 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mmsi_EndoscopySegmentMember | 948 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mmsi_EndoscopySegmentMember | 1,093 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = mmsi_EndoscopySegmentMember
Capital expenditures | $ 521 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = mmsi_EndoscopySegmentMember | $ 84 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = mmsi_EndoscopySegmentMember | $ 584 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = mmsi_EndoscopySegmentMember

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Details
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