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Segment Information and Enterprise Reporting - Analysis of Product Revenues Based upon Geographic Area Shipped (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 04, 2015	Mar. 29, 2014
Analysis of Product Revenues Based upon the Geographic Area Shipped
Total product revenue	$ 147,357us-gaap_SalesRevenueGoodsNet	$ 132,232us-gaap_SalesRevenueGoodsNet
Total product revenue, in percentage	100.00%us-gaap_ConcentrationRiskPercentage1	100.00%us-gaap_ConcentrationRiskPercentage1
North and South America | Reportable Geographical Components
Analysis of Product Revenues Based upon the Geographic Area Shipped
Total product revenue	111,478us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableGeographicalComponentsMember / us-gaap_StatementGeographicalAxis = us-gaap_AmericasMember	92,652us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableGeographicalComponentsMember / us-gaap_StatementGeographicalAxis = us-gaap_AmericasMember
Total product revenue, in percentage	75.70%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableGeographicalComponentsMember / us-gaap_StatementGeographicalAxis = us-gaap_AmericasMember	70.10%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableGeographicalComponentsMember / us-gaap_StatementGeographicalAxis = us-gaap_AmericasMember
Europe, Middle East and Africa | Reportable Geographical Components
Analysis of Product Revenues Based upon the Geographic Area Shipped
Total product revenue	24,061us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableGeographicalComponentsMember / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember	27,012us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableGeographicalComponentsMember / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember
Total product revenue, in percentage	16.30%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableGeographicalComponentsMember / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember	20.40%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableGeographicalComponentsMember / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember
Asia and Australia | Reportable Geographical Components
Analysis of Product Revenues Based upon the Geographic Area Shipped
Total product revenue	11,818us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableGeographicalComponentsMember / us-gaap_StatementGeographicalAxis = masi_SegmentGeographicalGroupOfCountriesGroupTwoMember	12,568us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableGeographicalComponentsMember / us-gaap_StatementGeographicalAxis = masi_SegmentGeographicalGroupOfCountriesGroupTwoMember
Total product revenue, in percentage	8.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableGeographicalComponentsMember / us-gaap_StatementGeographicalAxis = masi_SegmentGeographicalGroupOfCountriesGroupTwoMember	9.50%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableGeographicalComponentsMember / us-gaap_StatementGeographicalAxis = masi_SegmentGeographicalGroupOfCountriesGroupTwoMember
United States | Reportable Geographical Components
Analysis of Product Revenues Based upon the Geographic Area Shipped
Total product revenue	$ 107,276us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableGeographicalComponentsMember / us-gaap_StatementGeographicalAxis = country_US	$ 88,047us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableGeographicalComponentsMember / us-gaap_StatementGeographicalAxis = country_US

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