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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. 31, 2018
Apr. 01, 2017
Allowance for Doubtful Accounts Receivable [Roll Forward]    
Beginning balance $ 6,109 $ 5,140
Additions 1,056 636
Deduction (1,033) (643)
Ending balance $ 6,132 $ 5,133