Pre- and Post-Modification Recorded Investment Balances for Finance Receivables Modified by Portfolio Class (Detail) (Financial Services, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Modifications [Line Items]
Pre-Modification Recorded Investment	$ 13.8	$ 66.7
Post-Modification Recorded Investment	13.6	56.9
Retail | Fleet
Financing Receivable, Modifications [Line Items]
Pre-Modification Recorded Investment	11.4	64.0
Post-Modification Recorded Investment	11.2	54.2
Retail | Owner/operator
Financing Receivable, Modifications [Line Items]
Pre-Modification Recorded Investment	2.4	2.7
Post-Modification Recorded Investment	$ 2.4	$ 2.7