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Firm Commitments to Purchase Aircraft (Parenthetical) (Detail) (737-700 aircraft)
Dec. 31, 2014
Aircraft
737-700 aircraft
  
Commitments [Line Items]  
Number of aircrafts committed to purchase in 2015 2ual_NumberOfAircraftCommittedToPurchase
/ us-gaap_AircraftTypeAxis
= us-gaap_B737700Member