Segment Information - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Operating Segments [Line Items]
Revenue	$ 425,940	$ 425,215	$ 384,565
ROW (Segment) [Member]
Disclosure Of Operating Segments [Line Items]
Revenue	108,869
ROW (Segment) [Member] \| One major customer [Member]
Disclosure Of Operating Segments [Line Items]
Revenue	$ 37,197	$ 36,518	$ 53,465
Percentage of entity's revenue from major customer	8.73%	8.59%	13.90%

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