Recorded Investment for Finance Receivables that are on Non-accrual Status (Detail) - Financial Services - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment of finance receivables that are on non-accrual status	$ 65.7	$ 48.2
Dealer | Wholesale
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment of finance receivables that are on non-accrual status	5.0	4.9
Customer Retail | Fleet
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment of finance receivables that are on non-accrual status	50.7	34.4
Customer Retail | Owner/Operator
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment of finance receivables that are on non-accrual status	$ 10.0	$ 8.9