Stock-Based Compensation Expense - Summary of Stock Option Activity (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Oct. 01, 2017	Oct. 01, 2017
Shares (in thousands)
Outstanding, shares	6,433
Granted, shares	1,980
Exercised, shares	(1,731)
Forfeited or expired, shares	(84)
Outstanding, shares	6,598
Exercisable as of reporting date, shares		1,707
Options vested or expected to vest as of reporting date, shares		5,795
Weighted- Average Exercise Price
Outstanding, shares	$ 32.16
Granted, in dollars per share	77.87
Exercised, in dollars per share	25.85
Forfeited or expired, in dollars per share	45.57
Outstanding, shares	47.36
Outstanding	$ 32.16	$ 47.36
Exercisable as of reporting date, Weighted-Average Exercise Price, in dollars per share		27.96
Weighted- Average Remaining Contractual Term (in years)		$ 45.86
Weighted- Average Remaining Contractual Term (in years)
Outstanding, in years	7 years 9 months 7 days
Exercisable, in years	5 years 8 months 5 days
Options vested or expected to vest, in years	7 years 7 months 17 days
Aggregate Intrinsic Value (in thousands)
Outstanding, in dollars		$ 415,030
Exercisable, in dollars		140,559
Options vested or expected to vest, in dollars		$ 373,276