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Business Combinations - Summary of Unaudited Supplemental Pro Forma Information (Detail) - Smart RG and Sumitomo [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Pro forma revenue	$ 559,050	$ 702,573
Pro forma net income (loss)	$ (33,862)	$ 33,206
Pro forma earnings (loss) per share – basic	$ (0.71)	$ 0.69
Pro forma earnings (loss) per share – diluted	$ (0.71)	$ 0.68

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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