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Investments in Other Companies (Details) (USD $)
 12 Months Ended 0 Months Ended 1 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2012
TRIP
Jul. 12, 2012
TRIP
Sale of interest
item
Y
Sep. 30, 2008
TRIP
Common stock
Dec. 31, 2012
Trip Investimentos Ltda.
item
Jul. 12, 2012
Trip Investimentos Ltda.
Sale of interest
Jul. 12, 2012
Trip Investimentos Ltda.
Sale of interest
Minimum
Y
Jul. 12, 2012
Trip Investimentos Ltda.
Sale of interest
Maximum
Y
Sep. 30, 2010
Air Mekong
Dec. 31, 2011
Air Mekong
Dec. 31, 2012
Air Mekong
Dec. 31, 2012
TRIP and Air Mekong
Dec. 31, 2011
TRIP and Air Mekong
Investment in Other Companies                          
Percentage ownership acquired       20.00%         30.00%        
Company's investment balance   $ 19,100,000                 $ 1,700,000    
Proceeds from sale of equity method investment 8,064,000   42,000,000   8,100,000                
Second installment of equity interest sold         16,800,000                
Third installment of equity interest sold         16,800,000                
Number of installments     3   3                
Period of payment under purchase agreement (in years)     2                    
Option to acquire ownership (as a percent)         15.38% 15.38%              
Option exercise period (in years)             2 4          
Payments to acquire equity method investment                 7,000,000 3,000,000      
Company's portion of the losses attributable to its investments                       $ 10,200,000 $ 13,300,000
Voting ownership interest (as a percent)                     17.00%