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Components of Lease Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 28, 2020
Sep. 30, 2019
Sep. 28, 2020
Sep. 30, 2019
Leases [Abstract]        
Operating lease cost $ 2,333 $ 2,202 $ 7,041 $ 6,367
Variable lease cost 133 137 376 398
Short-term lease cost $ 84 $ 95 $ 482 $ 280