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Schedule of Net Periodic Pension and Postretirement (income) Cost (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 27, 2020
Sep. 29, 2019
Sep. 27, 2020
Sep. 29, 2019
Defined Benefit Plan Disclosure        
Net actuarial (gain) loss $ 0   $ 2,589 $ 448
UNITED STATES        
Defined Benefit Plan Disclosure        
Service cost 417 $ 402 1,283 1,206
Interest cost 1,460 1,797 4,505 5,392
Expected return on plan assets (1,170) (1,510) (3,634) (4,531)
Net actuarial (gain) loss 2,238 0 2,418 252
Settlement loss 450 0 450 0
Total net periodic pension cost 3,395 689 5,022 2,319
Foreign Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure        
Service cost 216 183 648 550
Interest cost 123 168 369 505
Expected return on plan assets (16) (7) (47) (21)
Net actuarial (gain) loss   0    
Settlement loss 0 0 0 0
Total net periodic pension cost 323 344 970 1,034
Postretirement Benefit Plans        
Defined Benefit Plan Disclosure        
Service cost 14 10 43 31
Interest cost 60 87 180 260
Amortization of prior service cost (2) (48) (7) (143)
Net actuarial (gain) loss 0 0 (279) 196
Total net periodic pension cost $ 72 $ 49 $ (63) $ 344