Debt - Schedule of Collateral Coverage Tests (Detail) - Secured Debt [Member]	12 Months Ended
	Dec. 31, 2017
Credit Facility 2013 [Member]
Debt Instrument [Line Items]
LTV Multiplier	1.6
Maximum LTV	62.50%
LTV as of Last Measurement Date	33.90%
Credit Facility 2014 [Member]
Debt Instrument [Line Items]
LTV Multiplier	1.6
Maximum LTV	62.50%
LTV as of Last Measurement Date	23.10%
April 2016 Credit Facilities [Member]
Debt Instrument [Line Items]
LTV Multiplier	1.6
Maximum LTV	62.50%
LTV as of Last Measurement Date	42.70%
December 2016 Credit Facilities [Member]
Debt Instrument [Line Items]
LTV Multiplier	1.6
Maximum LTV	62.50%
LTV as of Last Measurement Date	59.00%
American Airlines, Inc. [Member] | Credit Facility 2013 [Member]
Debt Instrument [Line Items]
LTV Multiplier	1.6
Maximum LTV	62.50%
LTV as of Last Measurement Date	33.90%
American Airlines, Inc. [Member] | Credit Facility 2014 [Member]
Debt Instrument [Line Items]
LTV Multiplier	1.6
Maximum LTV	62.50%
LTV as of Last Measurement Date	23.10%
American Airlines, Inc. [Member] | April 2016 Credit Facilities [Member]
Debt Instrument [Line Items]
LTV Multiplier	1.6
Maximum LTV	62.50%
LTV as of Last Measurement Date	42.70%
American Airlines, Inc. [Member] | December 2016 Credit Facilities [Member]
Debt Instrument [Line Items]
LTV Multiplier	1.6
Maximum LTV	62.50%
LTV as of Last Measurement Date	59.00%