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Finance and Other Receivables - Additional Information (Detail) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans accounted for as troubled debt restructurings $ 24,100,000   $ 37,900,000
TDRs charged-off during the period 0 $ 1,700,000  
Repossessed inventory 12,100,000   13,100,000
Proceeds from the sales of repossessed assets 51,100,000 $ 44,700,000  
Financial Services      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing receivable, recorded investment, 90 days past due and still accruing $ 0   $ 0
Months contractual terms extended 6 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%