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Depreciation of Revenue Earning Equipment and Lease Charges (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Depreciation of Revenue Earning Equipment and Lease Charges Disclosure [Abstract]      
Depreciation of revenue earning equipment $ 2,165,200,000 $ 1,921,800,000 $ 1,747,000,000
Adjustment of depreciation upon disposal of revenue earning equipment (96,800,000) (112,200,000) 42,900,000
Rents paid for vehicles leased 79,800,000 96,100,000 78,200,000
Total $ 2,148,158,000 $ 1,905,739,000 $ 1,868,147,000