XML 61 R51.htm IDEA: XBRL DOCUMENT v3.19.1
Finance and Other Receivables - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans accounted for as troubled debt restructurings $ 19,300,000   $ 20,100,000
TDRs charged-off during the period 0 $ 0  
Repossessed inventory 8,600,000   $ 10,800,000
Proceeds from the sales of repossessed assets $ 18,900,000 $ 8,500,000  
Financial Services      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Months contractual terms extended 5 months   6 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%