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Finance and Other Receivables - Additional Information (Detail) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans accounted for as troubled debt restructurings $ 18,100,000   $ 20,100,000
TDRs charged-off during the period 0 $ 0  
Repossessed inventory 10,500,000   $ 10,800,000
Proceeds from the sales of repossessed assets $ 30,400,000 35,200,000  
Financial Services      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Months contractual terms extended 5 months   6 months
Recorded Investment, subsequently defaulted $ 0    
Financial Services | Customer Retail | Fleet      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Recorded Investment, subsequently defaulted   $ 800,000  
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%