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Goodwill - Changes in Goodwill (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Goodwill [Roll Forward]    
Goodwill, beginning of period $ 19,780 $ 20,394
Foreign currency translation adjustment 837 (614)
Goodwill, end of period $ 20,617 $ 19,780