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Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 29, 2018
Jun. 30, 2017
Jun. 29, 2018
Jun. 30, 2017
Mar. 30, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Rollward]                
Accumulated other comprehensive loss $ (99,106) $ (83,922) $ (99,106) $ (83,922) $ (101,221) $ (102,937) $ (84,782) $ (86,181)
Activity                
Other comprehensive income (loss) before reclassifications 562 39 286 732        
Amounts reclassified from accumulated other comprehensive income 1,687 1,115 3,826 2,007        
Net current period other comprehensive income (loss) before tax 2,249 1,154 4,112 2,739        
Deferred taxes on current period activity 134 294 281 480        
Net current period other comprehensive income (loss) after tax 2,115 860 3,831 2,259        
Pension and Post Employment Benefits [Member]                
Accumulated Other Comprehensive Income (Loss) [Rollward]                
Accumulated other comprehensive loss (97,018) (80,842) (97,018) (80,842) (98,314) (99,592) (81,601) (82,358)
Activity                
Other comprehensive income (loss) before reclassifications 0 0 0 0        
Amounts reclassified from accumulated other comprehensive income 1,622 1,156 3,248 2,309        
Net current period other comprehensive income (loss) before tax 1,622 1,156 3,248 2,309        
Deferred taxes on current period activity 326 397 674 793        
Net current period other comprehensive income (loss) after tax 1,296 759 2,574 1,516        
Foreign Currency Translation [Member]                
Accumulated Other Comprehensive Income (Loss) [Rollward]                
Accumulated other comprehensive loss (3,939) (4,282) (3,939) (4,282) (2,995) (4,108) (4,557) (5,660)
Activity                
Other comprehensive income (loss) before reclassifications (944) 275 169 1,378        
Amounts reclassified from accumulated other comprehensive income 0 0 0 0        
Net current period other comprehensive income (loss) before tax (944) 275 169 1,378        
Deferred taxes on current period activity 0 0 0 0        
Net current period other comprehensive income (loss) after tax (944) 275 169 1,378        
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]                
Accumulated Other Comprehensive Income (Loss) [Rollward]                
Accumulated other comprehensive loss 1,851 1,202 1,851 1,202 88 763 1,376 1,837
Activity                
Other comprehensive income (loss) before reclassifications 1,506 (236) 117 (646)        
Amounts reclassified from accumulated other comprehensive income 65 (41) 578 (302)        
Net current period other comprehensive income (loss) before tax 1,571 (277) 695 (948)        
Deferred taxes on current period activity (192) (103) (393) (313)        
Net current period other comprehensive income (loss) after tax 1,763 (174) 1,088 (635)        
Forward Contract | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]                
Accumulated Other Comprehensive Income (Loss) [Rollward]                
Accumulated other comprehensive loss 1,582 1,109 1,582 1,109 326 959 1,476 1,837
Activity                
Other comprehensive income (loss) before reclassifications 871 (629) (327) (881)        
Amounts reclassified from accumulated other comprehensive income 42 47 419 (214)        
Net current period other comprehensive income (loss) before tax 913 (582) 92 (1,095)        
Deferred taxes on current period activity (343) (215) (531) (367)        
Net current period other comprehensive income (loss) after tax 1,256 (367) 623 (728)        
Precious Metal Contracts [Member] | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]                
Accumulated Other Comprehensive Income (Loss) [Rollward]                
Accumulated other comprehensive loss 269 93 269 93 $ (238) $ (196) $ (100) $ 0
Activity                
Other comprehensive income (loss) before reclassifications 635 393 444 235        
Amounts reclassified from accumulated other comprehensive income 23 (88) 159 (88)        
Net current period other comprehensive income (loss) before tax 658 305 603 147        
Deferred taxes on current period activity 151 112 138 54        
Net current period other comprehensive income (loss) after tax $ 507 $ 193 $ 465 $ 93