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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 9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Sep. 30, 2017
Oct. 01, 2016
Accounting Policies [Abstract]        
Options to purchase of shares of common stock 200 100 600 1,400
Net income attributable to stockholders of Masimo Corporation:        
Net income $ 39,235 $ 27,773 $ 131,248 $ 85,373
Net income attributable to Masimo Corporation stockholders 39,235 27,773 131,248 85,373
Net income        
Net income attributable to Masimo Corporation stockholders $ 39,235 $ 27,773 $ 131,248 $ 85,373
Weighted-average shares outstanding - basic 52,079 49,477 51,469 49,386
Net income per basic share $ 0.75 $ 0.56 $ 2.55 $ 1.73
Diluted net income per share:        
Weighted-average shares outstanding - basic 52,079 49,477 51,469 49,386
Diluted share equivalent: stock options and RSUs 4,084 4,088 4,498 3,451
Weighted-average shares outstanding - diluted 56,163 53,565 55,967 52,837
Net income per diluted share $ 0.70 $ 0.52 $ 2.35 $ 1.62