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Finance and Other Receivables - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Sep. 30, 2013
Financial Services
Dec. 31, 2012
Financial Services
Sep. 30, 2013
Financial Services
Minimum
Loans Receivable
Sep. 30, 2013
Financial Services
Maximum
Loans Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Modifications extended contractual terms       6 months 7 months    
Receivable, collection period           36 months 60 months
Impaired Loans $ 2.3   $ 6.8        
Percentage of portfolio 4.00%            
Loans accounted for as troubled debt restructurings       19.1 38.5    
Repossessed inventory 12.1   20.9        
Proceeds from the sales of repossessed assets $ 44.5 $ 48.7