Revenue - Schedule of Accounts Receivable and Deferred Revenues (Detail) $ in Thousands	9 Months Ended
	Sep. 29, 2018 USD ($)
Deferred Revenue - Short Term
Contract With Customer Asset And Liability [Line Items]
Deferred Revenue, Beginning balance	$ 74,332
Net increase (decrease) during the period	(15,965)
Deferred Revenue, Ending balance	58,367
Deferred Revenue - Long Term
Contract With Customer Asset And Liability [Line Items]
Deferred Revenue, Beginning balance	2,049
Net increase (decrease) during the period	(815)
Deferred Revenue, Ending balance	$ 1,234