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Non-operating income (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 26, 2020
Sep. 28, 2019
Sep. 26, 2020
Sep. 28, 2019
Nonoperating Income (Expense) [Abstract]        
Interest income $ 797 $ 3,664 $ 5,120 $ 10,706
Interest expense (84) (82) (250) (243)
Realized and unrealized foreign currency gains 647 (856) 1,246 (315)
Other (3) (3) (8) (10)
Non-operating income $ 1,357 $ 2,723 $ 6,108 $ 10,138