Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands	Mar. 29, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred Compensation Investment Assets	$ 2,915	$ 2,156
Foreign Currency Forward Contract	495	246
Precious Metal Swaps	112	237
Copper Swaps	273	0
Total Financial Assets	3,795	2,639
Deferred Compensation Investment Related Liability	2,915	2,156
Foreign Currency Forward Contract	136	432
Precious Metal Swaps	144	135
Copper Swaps	29	569
Total Financial Liabilities	3,224	3,292
Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred Compensation Investment Assets	2,915	2,156
Foreign Currency Forward Contract	0	0
Precious Metal Swaps	0	0
Copper Swaps	0	0
Total Financial Assets	2,915	2,156
Deferred Compensation Investment Related Liability	2,915	2,156
Foreign Currency Forward Contract	0	0
Precious Metal Swaps	0	0
Copper Swaps	0	0
Total Financial Liabilities	2,915	2,156
Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred Compensation Investment Assets	0	0
Foreign Currency Forward Contract	495	246
Precious Metal Swaps	112	237
Copper Swaps	273	0
Total Financial Assets	880	483
Deferred Compensation Investment Related Liability	0	0
Foreign Currency Forward Contract	136	432
Precious Metal Swaps	144	135
Copper Swaps	29	569
Total Financial Liabilities	309	1,136
Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred Compensation Investment Assets	0	0
Foreign Currency Forward Contract	0	0
Precious Metal Swaps	0	0
Copper Swaps	0	0
Total Financial Assets	0	0
Deferred Compensation Investment Related Liability	0	0
Foreign Currency Forward Contract	0	0
Precious Metal Swaps	0	0
Copper Swaps	0	0
Total Financial Liabilities	$ 0	$ 0