Commitments and Contingencies - Additional Information (Detail)									1 Months Ended	12 Months Ended
	Nov. 05, 2016 USD ($)	Jul. 20, 2016 USD ($)	Apr. 08, 2016 USD ($)	Jan. 26, 2016 ft²	Oct. 01, 2014 USD ($)	Jan. 16, 2014 USD ($)	Jan. 03, 2014 USD ($)	Jul. 09, 2009 patent	Sep. 30, 2011 sales_representatives	Dec. 31, 2016 USD ($) ft² distributor Agreement $ / shares shares	Jan. 02, 2016 USD ($) distributor $ / shares shares	Jan. 03, 2015 USD ($) $ / shares shares	Oct. 21, 2015 claim	Oct. 03, 2015 USD ($)	Jan. 31, 2014 participant
Contingencies And Commitments [Line Items]
Property Plant and Equipment, Occupied Square Feet | ft²				70,700						16,830
Accrued rent expense										$ 700,000	$ 200,000
Rental expense related to operating leases										5,300,000	5,200,000	$ 6,100,000
Interest included in future minimum capital lease payments (less than $0.1 million)										$ 100,000
Employee contribution percentage limit for full consideration under Employee Retirement Savings Plan										3.00%
Severance plan participation agreements | Agreement										7
Required notice of resignation										6 months
Remaining amount committed										$ 76,800,000
Commitments and contingencies (Notes 4 and 15)
Bank balances										306,000,000
Bank balance covered by Federal Deposit Insurance Corporation limit										$ 2,900,000
Concentration Risk, Customer Accounts Receivable, Percentage										13.60%	10.50%
Royalty										$ 30,779,000	$ 30,777,000	29,879,000
Royalty rate Percentage										7.75%
Royalty Revenue, Number of Days Royalty Revenue is Adjusted Subsequent to Quarter End										60 days
Number of Former Sales Representatives | sales_representatives									2
Litigation Settlement, Amount					$ 466,800,000
Litigation settlement, award and/or defense costs										$ (270,000,000)	(19,609,000)	(10,331,000)
Number of Participants in the Surfactant, Positive Pressure, and Oxygenation Randomized Trial | participant															2
Number of inter partes review petitions, Patent Trial and Appeal Board of the US Patent Office | claim													3
Pulse oximetry products
Contingencies And Commitments [Line Items]
Sale of company's products to customers										375,000,000	337,400,000	309,900,000
Masimo vs. Philips
Contingencies And Commitments [Line Items]
Number of patents allegedly infringed | patent								1
Masimo vs Philips N.V. [Member]
Contingencies And Commitments [Line Items]
Litigation Settlement, Amount	$ 300,000,000
Masimo vs Former Physician Office Sales Representatives
Contingencies And Commitments [Line Items]
Litigation Settlement, Amount			$ 6,200,000			$ 5,400,000
Litigation settlement, award and/or defense costs		$ 2,600,000
Masimo vs. Physicians Healthsource, Inc. [Member]
Contingencies And Commitments [Line Items]
Damages sought per violation							$ 500
Parent Company [Member]
Contingencies And Commitments [Line Items]
Number of patents allegedly infringed | patent								2
Litigation settlement, award and/or defense costs											(19,609,000)	$ (8,010,000)
Philips Patent [Member]
Contingencies And Commitments [Line Items]
Number of patents allegedly infringed | patent								1
Unsecured Bank Guarantees
Contingencies And Commitments [Line Items]
Commitments and contingencies (Notes 4 and 15)										500,000
Revolving Credit Facility [Member]
Contingencies And Commitments [Line Items]
Long-term Line of Credit, Noncurrent										0	$ 185,000,000
CEO Employment Agreement [Member]
Contingencies And Commitments [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award											2.7
Supplemental Unemployment Benefits, Severance Benefits														$ 35,000,000
Employment Agreement, Severance Terms											10.00%
Employment Agreement, Severance Benefits, Special Payment, Qualifying Termination										$ 146,900,000
Sales [Member]
Contingencies And Commitments [Line Items]
Number of just-in-time distributors | distributor										2
Accounts Receivable [Member]
Contingencies And Commitments [Line Items]
Number of just-in-time distributors | distributor										2	2
Restricted Stock Units (RSUs) [Member]
Contingencies And Commitments [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expired in Period | shares										0	0	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares										$ 43.09	$ 41,450.00	$ 0.00
Just in time distributor one | Sales Revenue, Net [Member]
Contingencies And Commitments [Line Items]
Percentage Of Revenue Two Customer										14.00%	14.60%	14.00%
Just in time distributor one | Accounts Receivable [Member]
Contingencies And Commitments [Line Items]
Percentage Of Accounts Receivable Balance From Three Just In Time Distributors										7.50%	5.50%
Just in time distributor two | Sales Revenue, Net [Member]
Contingencies And Commitments [Line Items]
Percentage Of Revenue Two Customer										12.80%	11.70%	0.00%
Just in time distributor two | Accounts Receivable [Member]
Contingencies And Commitments [Line Items]
Percentage Of Accounts Receivable Balance From Three Just In Time Distributors										5.60%
Percentage of accounts receivable balance from two just-in-time distributor											5.30%
UNITED STATES
Contingencies And Commitments [Line Items]
Company's contribution to employee retirement savings plan										$ 1,900,000	$ 1,800,000	$ 1,700,000
OUTSIDE UNITED STATES [Domain]
Contingencies And Commitments [Line Items]
Company's contribution to employee retirement savings plan										$ 300,000	$ 300,000	$ 200,000