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Related Party Transactions (Details) - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Related Party Transaction [Line Items]    
Net charter expense $ 131,257,000 $ 232,405,000
Percentage of tax benefits realized payable 85.00%  
Percentage retained under tax receivable agreement 15.00%  
Tax receivable agreement, liability $ 82,500,000  
Tax receivable agreement, liability, discount rate 5.20%  
Affiliated Entity    
Related Party Transaction [Line Items]    
Rent expense $ 2,700,000 1,900,000
Western Airlines    
Related Party Transaction [Line Items]    
Net charter expense $ 6,800 $ 400,000