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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. 03, 2015
Sep. 27, 2014
Oct. 03, 2015
Sep. 27, 2014
Accounting Policies [Abstract]        
Options to purchase of shares of common stock 500 3,100 600 1,500
Net income attributable to stockholders of Masimo Corporation:        
Net income including noncontrolling interest $ 17,929 $ 16,134 $ 56,447 $ 52,577
Net loss attributable to the noncontrolling interest 1,396 (1,271) 2,752 (1,280)
Net income attributable to Masimo Corporation stockholders 19,325 14,863 59,199 51,297
Basic net income per share attributable to Masimo Corporation stockholders:        
Net income attributable to Masimo Corporation stockholders $ 19,325 $ 14,863 $ 59,199 $ 51,297
Weighted average shares outstanding - basic (in shares) 50,974 53,988 51,653 55,521
Basic net income per share attributable to Masimo Corporation stockholders (in usd per share) $ 0.38 $ 0.28 $ 1.15 $ 0.92
Diluted net income per share attributable to Masimo Corporation stockholders:        
Weighted average shares outstanding - basic (in shares) 50,974 53,988 51,653 55,521
Diluted share equivalent: stock options (in shares) 2,712 630 2,293 860
Weighted average shares outstanding - diluted (in shares) 53,686 54,618 53,946 56,381
Diluted net income per share attributable to Masimo Corporation stockholders (in usd per share) $ 0.36 $ 0.27 $ 1.10 $ 0.91