Revenue - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenue From Contract With Customers [Line Items]
Revenue, performance obligation, description of timing	Delivery periods of less than a month
Revenue, performance obligation, description of payment terms	Customer payment is generally due 40-60 days after shipment
Deferred revenue, revenue recognized	$ 1.6	$ 1.7
Contract with customer, timing of satisfaction of performance obligation and payment	Contract terms are substantially less than a year (generally less than one month)
Tooling Reimbursement [Member]
Revenue From Contract With Customers [Line Items]
Deferred revenue, revenue recognized	$ 1.6
Price Adjustments [Member]
Revenue From Contract With Customers [Line Items]
Deferred revenue, revenue recognized	$ 1.7