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Segment Reporting - Operating Income (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Segment Reporting Information [Line Items] |  |
Revenues | $ 129,577 us-gaap_SalesRevenueGoodsNet | $ 119,236 us-gaap_SalesRevenueGoodsNet
Operating income | 8,704 us-gaap_OperatingIncomeLoss | 6,489 us-gaap_OperatingIncomeLoss
Cardiovascular Segment |  |
Segment Reporting Information [Line Items] |  |
Revenues | 124,764 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = mmsi_CardiovascularSegmentMember | 114,907 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = mmsi_CardiovascularSegmentMember
Operating income | 8,069 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mmsi_CardiovascularSegmentMember | 6,396 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mmsi_CardiovascularSegmentMember
Endoscopy Segment |  |
Segment Reporting Information [Line Items] |  |
Revenues | 4,813 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = mmsi_EndoscopySegmentMember | 4,329 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = mmsi_EndoscopySegmentMember
Operating income | $ 635 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mmsi_EndoscopySegmentMember | $ 93 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mmsi_EndoscopySegmentMember

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