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Finance and Other Receivables - Additional Information (Detail) - Financial Services - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing receivable, recorded investment, 90 days past due and still accruing $ 0.0   $ 0.0
Months contractual terms extended 4 months   4 months
Loans accounted for as troubled debt restructurings $ 43.5   $ 43.1
Repossessed inventory 26.6   $ 25.4
Proceeds from the sales of repossessed assets $ 29.2 $ 21.7  
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%