Transactions with Related Parties - Additional Information (Detail) - USD ($) $ in Billions |
12 Months Ended | ||
---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
American Airlines, Inc. [Member] | Regional Carrier [Member] | AAG's Wholly-owned Subsidiaries [Member] | Airline Capacity Purchase Arrangements [Member] | |||
Related Party Transaction [Line Items] | |||
Related party transaction, expense recognized | $ 1.7 | $ 1.5 | $ 1.2 |