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Basis of Presentation and Summary of Significant Accounting Policies - Allowance for Doubtful Accounts Roll Forward (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 29, 2019
Jun. 30, 2018
Allowance for Doubtful Accounts Receivable [Roll Forward]    
Beginning balance $ 7,663 $ 6,109
Additions 3,793 1,825
Deduction (3,426) (1,778)
Ending balance $ 8,030 $ 6,156