Pre- and Post-Modification Recorded Investment Balances for Finance Receivables Modified by Portfolio Class (Detail) (Financial Services, USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Financing Receivable, Modifications [Line Items]
Pre-Modification Recorded Investment	$ 0.8	$ 3.7	$ 6.7	$ 8.4
Post-Modification Recorded Investment	0.8	3.7	6.7	8.3
Customer Retail | Fleet
Financing Receivable, Modifications [Line Items]
Pre-Modification Recorded Investment	0.5	3.5	5.4	7.7
Post-Modification Recorded Investment	0.5	3.5	5.4	7.6
Customer Retail | Owner/Operator
Financing Receivable, Modifications [Line Items]
Pre-Modification Recorded Investment	0.3	0.2	1.3	0.7
Post-Modification Recorded Investment	$ 0.3	$ 0.2	$ 1.3	$ 0.7