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Schedule of Net Periodic Pension and Postretirement (income) Cost (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jul. 01, 2018
Jun. 30, 2019
Jul. 01, 2018
Defined Benefit Plan Disclosure        
Net actuarial (gain) loss     $ 448 $ (71)
UNITED STATES        
Defined Benefit Plan Disclosure        
Service cost $ 399 $ 545 804 1,116
Interest cost 1,799 2,430 3,595 5,427
Expected return on plan assets (1,510) (2,550) (3,021) (5,919)
Amortization of prior service cost   14   29
Net actuarial (gain) loss 252 (189) 252 (189)
Settlement loss   78   78
Total net periodic pension cost 940 328 1,630 542
Foreign Pension Plans, Defined Benefit        
Defined Benefit Plan Disclosure        
Service cost 192 200 381 426
Interest cost 176 175 349 372
Expected return on plan assets (7) (5) (14) (10)
Total net periodic pension cost 361 370 716 788
Postretirement Benefit Plans        
Defined Benefit Plan Disclosure        
Service cost 11 10 20 19
Interest cost 88 48 173 98
Amortization of prior service cost (48) (93) (95) (187)
Net actuarial (gain) loss 196 40 196 40
Special termination benefits   1,192   2,818
Total net periodic pension cost $ 247 $ 1,197 $ 294 $ 2,788