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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. 28, 2019
Sep. 29, 2018
Allowance for Doubtful Accounts Receivable [Roll Forward]    
Beginning balance $ 7,663 $ 6,109
Additions 6,014 2,752
Deduction (5,461) (2,175)
Ending balance $ 8,216 $ 6,686