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Retirement Plans - Defined Benefit Plan, Net Periodic Benefit Cost (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
United States [Member] | Pension Plans [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 142 $ 124 $ 284 $ 225
Interest cost 1,627 1,696 3,246 3,415
Expected return on plan assets (630) (2,487) (3,415) (5,150)
Net amortization: Net actuarial loss 772 734 1,541 1,385
Net periodic pension cost (benefit) 1,911 67 1,656 (125)
United States [Member] | Healthcare Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 151 170 283 273
Interest cost 162 159 318 309
Expected return on plan assets (175) (147) (353) (294)
Net amortization: Prior service (credit) cost (2)   (10)  
Net periodic pension cost (benefit) 136 182 238 288
Non-U.S. Pension Plans [Member] | Pension Plans [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1,339 1,240 2,713 2,491
Interest cost 416 368 844 726
Expected return on plan assets (481) (414) (974) (816)
Net amortization: Prior service (credit) cost (32) (47) (63) (93)
Net amortization: Net actuarial loss 171 235 348 466
Net periodic pension cost (benefit) $ 1,413 $ 1,382 $ 2,868 $ 2,774