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Note Receivable (Details) (Receivables related to United Express Agreement, SkyWest Airlines, USD $)
In Millions, unless otherwise specified
0 Months Ended 12 Months Ended
Oct. 16, 2009
D
Dec. 31, 2012
D
Dec. 31, 2011
D
Receivables related to United Express Agreement | SkyWest Airlines
     
Loan provided by subsidiary to United      
Deferral period, maximum (in days) 30    
Deferral amount, maximum   $ 49 $ 49
Deferral fee (as a percent)   8.00%  
Amount of loan deferred and classified as current   $ 49.0  
Deferred period (in days)   30 30