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Estimated Useful Lives of Property and Equipment (Detail)	12 Months Ended
	Dec. 31, 2016
Aircraft and related rotable parts | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	25 years
Aircraft and related rotable parts | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	30 years
Buildings | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	25 years
Buildings | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	45 years
Other property and equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	3 years
Other property and equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	15 years
Computer software
Property, Plant and Equipment [Line Items]
Estimated Useful Life	5 years
Building improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	1 year
Building improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	40 years

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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