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Finance and Other Receivables - Additional Information (Detail) - Financial Services - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Months contractual terms extended 3 months   7 months
Loans accounted for as troubled debt restructurings $ 50.1   $ 52.3
Repossessed inventory 21.3   $ 14.6
Proceeds from the sales of repossessed assets $ 12.4 $ 17.3  
Loans And Leases | Minimum      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Contractual terms of retails loans and finance leases 36 months    
Loans And Leases | Maximum      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Contractual terms of retails loans and finance leases 60 months    
Financing Receivable | Maximum | Credit Concentration Risk      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Percentage of portfolio assets 5.00%