XML 132 R79.htm IDEA: XBRL DOCUMENT v3.21.1
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