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Basis of Presentation and Summary of Significant Accounting Policies - Allowance for Doubtful Accounts Roll Forward (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 26, 2020
Sep. 28, 2019
Allowance for Doubtful Accounts Receivable [Roll Forward]    
Beginning balance $ 9,560 $ 7,663
Impact of CECL Adoption 985  
Additions 7,826 6,014
Deduction (5,784) (5,461)
Ending balance $ 12,587 $ 8,216