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Retirement Plans - Defined Benefit Plan, Net Periodic Benefit Cost (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 27, 2020
Jun. 29, 2019
Jun. 27, 2020
Jun. 29, 2019
United States [Member] | Pension Plans [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost   $ 10   $ 23
Net periodic pension cost   10   23
United States [Member] | Retiree Healthcare Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 151 108 $ 302 250
Interest cost 177 230 353 389
Expected return on plan assets (220) (177) (439) (354)
Net amortization: Prior service credit (5) (5) (10) (10)
Net periodic pension cost 103 156 206 275
Non-U.S. Pension Plans [Member] | Pension Plans [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1,095 1,075 2,194 2,157
Interest cost 338 430 683 864
Expected return on plan assets (454) (538) (910) (1,081)
Net amortization: Prior service credit (41) (37) (81) (74)
Net amortization: Net actuarial loss 382 132 767 267
Net periodic pension cost $ 1,320 $ 1,062 $ 2,653 $ 2,133