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Carrying Amount and Fair Value of Financial Services Fixed-Rate Loans and Fixed-Rate Debt (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Financial Services
   
Assets, Carrying Amount    
Fixed-rate loans, Carrying Amount $ 3,361.7 $ 2,740.1
Liabilities, Carrying Amount    
Fixed-rate debt, Carrying Amount 3,277.2 1,958.6
Assets, Fair Value    
Fixed-rate loans, Fair Value 3,434.8 2,776.1
Liabilities, Fair Value    
Fixed-rate debt, Fair Value 3,350.5 2,021.1
Truck, Parts and Other
   
Liabilities, Carrying Amount    
Fixed-rate debt, Carrying Amount 150.0 150.0
Liabilities, Fair Value    
Fixed-rate debt, Fair Value $ 160.6 $ 167.6