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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. 29, 2018
Sep. 30, 2017
Allowance for Doubtful Accounts Receivable [Roll Forward]    
Beginning balance $ 6,109 $ 5,140
Additions 2,752 2,545
Deduction (2,175) (1,586)
Ending balance $ 6,686 $ 6,099