Finance Receivables (Narrative) (Detail) (USD $)	Jun. 30, 2013	Dec. 31, 2012	Jul. 01, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	$ 0	$ 0	$ 0
Wholesale finance receivables, gross	200,000	400,000	600,000
Retail [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	0	0	0
Wholesale finance receivables, gross	13,900,000	27,600,000	14,800,000
Wholesale [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	0	0	0
Financing Receivable, Recorded Investment, Nonaccrual Status	0	0	0
Nonperforming Financing Receivable [Member] | Wholesale [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	$ 0	$ 0	$ 0