Summary of Impaired Loans and Specific Reserve (Cash Basis Method) (Detail) (Financial Services, USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2014	Mar. 31, 2013
Interest income recognized:
Interest income recognized on a cash basis	$ 0.5	$ 0.6
Dealer \| Wholesale
Interest income recognized:
Interest income recognized on a cash basis	0.1	0.4
Customer Retail \| Fleet
Interest income recognized:
Interest income recognized on a cash basis	0.3
Customer Retail \| Owner/Operator
Interest income recognized:
Interest income recognized on a cash basis	$ 0.1	$ 0.2

Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)(3)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5212-111524

Name:	us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration