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Inventories - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Classes Of Inventories [Abstract]
Inventories recognized as expense	$ 384,995	$ 356,263	$ 364,662
Amount expensed (credited) to cost of sales	$ 532	$ (3,306)	$ 1,481

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- References

No definition available.

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- Definition

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

+ References

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- Definition

The amount recognised resulting from the write-down of inventories to net realisable value or reversals of those write-downs. [Refer: Inventories]

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