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Expendable Parts and Supplies - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Classes of current inventories [abstract]
Expendable parts and supplies expense	$ 12.7	$ 32.4	$ 31.9

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- References

No definition available.

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- Definition

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

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