Accounts Receivable, Net - Reconciliation of Beginning and Ending Amount of Allowance for Contract Losses and Doubtful Accounts (Detail) - USD ($) $ in Thousands	9 Months Ended
	Oct. 02, 2020	Sep. 27, 2019
Receivables [Abstract]
Balance at January 3, 2020	$ 4,295
Provision for contract losses and doubtful accounts	2,890	$ 2,146
Write-offs	(1,351)
Balance at October 2, 2020	$ 5,834