Finance Receivables (Narrative) (Detail) - USD ($)	Sep. 27, 2015	Dec. 31, 2014	Sep. 28, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	$ 0	$ 0	$ 0
Greater than 90 Days Past Due	23,956,000	28,918,000	20,500,000
Retail [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	0	0	0
Wholesale finance receivables, gross	23,800,000	28,700,000	20,300,000
Greater than 90 Days Past Due	23,808,000	28,712,000	20,343,000
Wholesale [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	0	0	0
Greater than 90 Days Past Due	148,000	206,000	157,000
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