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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
Oct. 01, 2016
Oct. 03, 2015
Oct. 01, 2016
Oct. 03, 2015
Accounting Policies [Abstract]        
Options to purchase of shares of common stock 100 500 1,400 600
Net income attributable to stockholders of Masimo Corporation:        
Net income including noncontrolling interest $ 27,773 $ 17,929 $ 85,373 $ 56,447
Net loss attributable to the noncontrolling interest 0 1,396 0 2,752
Net income attributable to Masimo Corporation stockholders 27,773 19,325 85,373 59,199
Basic net income per share attributable to Masimo Corporation stockholders:        
Net income attributable to Masimo Corporation stockholders $ 27,773 $ 19,325 $ 85,373 $ 59,199
Weighted average shares outstanding - basic (in shares) 49,477 50,974 49,386 51,653
Basic net income per share attributable to Masimo Corporation stockholders (in usd per share) $ 0.56 $ 0.38 $ 1.73 $ 1.15
Diluted net income per share attributable to Masimo Corporation stockholders:        
Weighted average shares outstanding - basic (in shares) 49,477 50,974 49,386 51,653
Diluted share equivalent: stock options (in shares) 4,088 2,712 3,451 2,293
Weighted average shares outstanding - diluted (in shares) 53,565 53,686 52,837 53,946
Diluted net income per share attributable to Masimo Corporation stockholders (in usd per share) $ 0.52 $ 0.36 $ 1.62 $ 1.10