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Basis of Presentation and Summary of Significant Accounting Policies - Allowance for Doubtful Accounts Roll Forward (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 30, 2019
Mar. 31, 2018
Allowance for Doubtful Accounts Receivable [Roll Forward]    
Beginning balance $ 7,663 $ 6,109
Additions 2,159 1,056
Deduction (2,324) (1,033)
Ending balance $ 7,498 $ 6,132