Summary of Significant Accounting Policies - Revenue by Significant Category (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]
Revenues	$ 425,215	$ 384,565	$ 389,632
Manufactured Products [Member]
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]
Revenues	361,853	296,075	318,672
Distributed Products [Member]
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]
Revenues	41,985	75,200	62,128
SDI [Member]
Disclosure Of Disaggregation Of Revenue From Contracts With Customers [Line Items]
Revenues	$ 21,377	$ 13,290	$ 8,832

The income arising in the course of an entity's ordinary activities. Income is increases in economic benefits during the accounting period in the form of inflows or enhancements of assets or decreases of liabilities that result in an increase in equity, other than those relating to contributions from equity participants.

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+ Details