v2.4.0.8
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 6 Months Ended
Jun. 29, 2013
Jun. 30, 2012
Jun. 29, 2013
Jun. 30, 2012
Net income attributable to stockholders of Masimo Corporation:        
Net income including noncontrolling interest $ 14,648 $ 17,768 $ 31,050 $ 33,534
Net (income) loss attributable to the noncontrolling interest 2,390 (71) 2,416 (63)
Net income attributable to Masimo Corporation stockholders 17,038 17,697 33,466 33,471
Basic net income per share attributable to Masimo Corporation stockholders:        
Net income attributable to Masimo Corporation stockholders $ 17,038 $ 17,697 $ 33,466 $ 33,471
Weighted average shares outstanding - basic 56,440 57,141 56,840 57,660
Basic net income per share attributable to Masimo Corporation stockholders $ 0.30 $ 0.31 $ 0.59 $ 0.58
Diluted net income per share attributable to Masimo Corporation stockholders:        
Weighted average shares outstanding - basic 56,440 57,141 56,840 57,660
Diluted share equivalent: stock options 764 943 767 952
Weighted average shares outstanding - diluted 57,204 58,084 57,607 58,612
Diluted net income per share attributable to Masimo Corporation stockholders $ 0.30 $ 0.30 $ 0.58 $ 0.57