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Finance and Other Receivables - Additional Information (Detail) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans accounted for as troubled debt restructurings $ 27.3   $ 37.9
TDRs charged-off during the period 0.0 $ 0.4  
Repossessed inventory 20.9   13.1
Proceeds from the sales of repossessed assets 35.2 $ 29.2  
Financial Services      
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 5 months   5 months
Financial Services | Loans and Leases | Minimum      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Contractual terms of retails loans and finance leases 36 months    
Financial Services | Loans and Leases | Maximum      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Contractual terms of retails loans and finance leases 60 months    
Financial Services | Financing Receivable | Maximum | Credit Concentration Risk      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Percentage of portfolio assets 5.00%