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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
Apr. 02, 2016
Apr. 04, 2015
Accounting Policies [Abstract]    
Options to purchase of shares of common stock 1,500 3,200
Net income attributable to stockholders of Masimo Corporation:    
Net income including noncontrolling interest $ 27,577 $ 19,822
Net loss attributable to the noncontrolling interest 0 701
Net income attributable to Masimo Corporation stockholders 27,577 20,523
Basic net income per share attributable to Masimo Corporation stockholders:    
Net income attributable to Masimo Corporation stockholders $ 27,577 $ 20,523
Weighted average shares outstanding - basic (in shares) 49,424 52,687
Basic net income per share attributable to Masimo Corporation stockholders (in usd per share) $ 0.56 $ 0.39
Diluted net income per share attributable to Masimo Corporation stockholders:    
Weighted average shares outstanding - basic (in shares) 49,424 52,687
Diluted share equivalent: stock options (in shares) 2,525 1,277
Weighted average shares outstanding - diluted (in shares) 51,949 53,964
Diluted net income per share attributable to Masimo Corporation stockholders (in usd per share) $ 0.53 $ 0.38