Derivative Instruments - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2019 USD ($) Derivative	Mar. 31, 2018 USD ($)
Derivative [Line Items]
Anticipated foreign-denominated sales hedge	$ 20,917,000
Number of derivative instruments holds for trading purposes | Derivative	0
(Losses) gains on foreign exchange transactions included in other income (expense)	$ 348,000	$ 67,000
Copper Purchases [Member]
Derivative [Line Items]
Percentage of anticipated purchases hedged	49.00%
Time period for hedged purchases	10 months
Copper Purchases [Member] | Cash Flow Hedges [Member]
Derivative [Line Items]
Anticipated purchases, hedged	$ 2,389,000
Aluminum Purchases [Member]
Derivative [Line Items]
Percentage of anticipated purchases hedged	56.00%
Time period for hedged purchases	6 months
Aluminum Purchases [Member] | Cash Flow Hedges [Member]
Derivative [Line Items]
Anticipated purchases, hedged	$ 496,000