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