Finance Receivables (Narrative) (Detail) - USD ($)	Jun. 28, 2015	Dec. 31, 2014	Jun. 29, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	$ 0	$ 0	$ 0
Greater than 90 Days Past Due	18,447,000	28,918,000	14,720,000
Retail [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	0	0	0
Wholesale finance receivables, gross	18,300,000	28,700,000	14,700,000
Greater than 90 Days Past Due	18,274,000	28,712,000	14,686,000
Wholesale [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	0	0	0
Greater than 90 Days Past Due	173,000	206,000	34,000
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