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Summary of Significant Accounting Policies - Reconciliation of Basic and Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Apr. 01, 2017
Accounting Policies [Abstract] |  |
Options to purchase of shares of common stock | 900 | 100
Net income attributable to stockholders of Masimo Corporation: |  |
Net income | $ 45,630 | $ 51,533
Net income | 45,630 | 51,533
Net income |  |
Net income | $ 45,630 | $ 51,533
Weighted-average shares outstanding - basic | 51,709 | 50,652
Net income per basic share | $ 0.88 | $ 1.02
Diluted net income per share: |  |
Weighted-average shares outstanding - basic | 51,709 | 50,652
Diluted share equivalent: stock options and RSUs | 3,787 | 4,877
Weighted-average shares outstanding - diluted | 55,496 | 55,529
Net income per diluted share | $ 0.82 | $ 0.93

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