Segment Information - Additional Information (Detail) $ in Thousands	12 Months Ended
Dec. 31, 2017 USD ($) Segment	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Disclosure Of Operating Segments [Line Items]
Number of operating segments \| Segment	3
Sales of goods / services	$ 425,215	$ 384,565	$ 389,632
Rest of the World (Segment) [Member] \| One major customer [Member]
Disclosure Of Operating Segments [Line Items]
Sales of goods / services	$ 36,518	$ 53,465	$ 42,279
Percentage of entity's revenue from major customer	8.59%	13.90%	10.90%

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