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Basis of Presentation - Summary of Financial Effects Due to Transition of Agreements (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Prepaid expense and other current assets $ 28,638   $ 20,310
Other non-currentassets 56,127   67,107
Accrued liabilities 163,521   201,815
Current deferred airborne lease incentive 29,472   42,096
Non-current deferred airborne lease incentive 124,653   $ 142,938
Equipment revenue 81,147 $ 18,911  
Cost of equipment revenue 52,293 $ 11,648  
Transition Agreements To Airline-directed Model [Member]      
Prepaid expense and other current assets 6,603    
Property and equipment, net (34,965)    
Other non-currentassets 18,783    
Accrued liabilities 2,000    
Current deferred airborne lease incentive (13,592)    
Non-current deferred airborne lease incentive (17,289)    
Equipment revenue 45,396    
Cost of equipment revenue $ 26,094