Annual report pursuant to Section 13 and 15(d)

Schedule II - Valuation Accounts (Detail)

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Schedule II - Valuation Accounts (Detail) - Allowance for Doubtful Accounts - USD ($)
$ in Thousands
12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance $ 907 $ 601 $ 627
Additions charged to cost and expense 282 401 117
Others (68) (95) (143)
Balance $ 1,121 $ 907 $ 601