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Inventories - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Classes of current inventories [abstract]
Cost of materials and supplies consumed	$ 120,422	$ 103,073
Inventory write-down	$ 444	$ 0

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- Definition

The amount of inventories recognised as an expense during the period. [Refer: Inventories]

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The amount of expense recognised related to the write-down of inventories to net realisable value. [Refer: Inventories]

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