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Expendable Parts and Supplies - Disclosure of Expendable Parts and Supplies (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Classes of current inventories [abstract] |  |
Material for repair and maintenance | $ 69,737 | $ 66,418
Other inventories | 4,920 | 3,686
Expendable parts and supplies, gross | 74,657 | 70,104
Allowance for obsolescence | (338) | (1,004)
Expendable parts and supplies | $ 74,319 | $ 69,100

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