v2.4.0.6
Summary of Significant Accounting Policies - Reconciliation of Basic and Diluted Net Income Per Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 29, 2012
Oct. 01, 2011
Sep. 29, 2012
Oct. 01, 2011
Net income attributable to stockholders of Masimo Corporation:        
Net income including noncontrolling interest $ 13,563 $ 14,824 $ 47,097 $ 49,887
Net (income) loss attributable to the noncontrolling interest 231 5 168 (7)
Net income attributable to Masimo Corporation stockholders 13,794 14,829 47,265 49,880
Basic net income per share attributable to Masimo Corporation stockholders:        
Net income attributable to Masimo Corporation stockholders $ 13,794 $ 14,829 $ 47,265 $ 49,880
Weighted average shares outstanding - basic 57,201 59,971 57,507 59,804
Basic net income per share attributable to Masimo Corporation stockholders $ 0.24 $ 0.25 $ 0.82 $ 0.83
Diluted net income per share attributable to Masimo Corporation stockholders:        
Weighted average shares outstanding - basic 57,201 59,971 57,507 59,804
Diluted share equivalent: stock options 944 1,115 947 1,278
Weighted average shares outstanding - diluted 58,145 61,086 58,454 61,082
Diluted net income per share attributable to Masimo Corporation stockholders $ 0.24 $ 0.24 $ 0.81 $ 0.82