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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
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Apr. 04, 2015 | Mar. 29, 2014
Analysis of Product Revenues Based upon the Geographic Area Shipped |  |
Total product revenue | $ 147,357 us-gaap_SalesRevenueGoodsNet | $ 132,232 us-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 | 111,478 us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableGeographicalComponentsMember / us-gaap_StatementGeographicalAxis = us-gaap_AmericasMember | 92,652 us-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 | 24,061 us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableGeographicalComponentsMember / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember | 27,012 us-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 | 11,818 us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableGeographicalComponentsMember / us-gaap_StatementGeographicalAxis = masi_SegmentGeographicalGroupOfCountriesGroupTwoMember | 12,568 us-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 | $ 107,276 us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableGeographicalComponentsMember / us-gaap_StatementGeographicalAxis = country_US | $ 88,047 us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_ReportableGeographicalComponentsMember / us-gaap_StatementGeographicalAxis = country_US

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