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Debt - Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Mar. 31, 2014
Maturity Year One
Mar. 31, 2014
Maturity Year Two
Mar. 06, 2014
Revolving Credit Facility
Dec. 31, 2013
Revolving Credit Facility
Mar. 31, 2014
Revolving Credit Facility
Maturity Year One
Debt Instrument [Line Items]                
Revolving credit facility $ 9,573,726   $ 8,099,773     $ 300,000 $ 8,099,773 $ 4,500,000
Credit facility maturity date       Dec. 31, 2016 Dec. 31, 2018      
Private issuance notes secured with vehicle lease 1,396,011              
Interest expense on secured structured financing $ 59,862 $ 57,710