Asset-Backed Financing (Schedule of Loans Acquired in Transfer Not Accounted For as Debt Securities) (Detail) - Secured Debt - Variable Interest Entity, Not Primary Beneficiary - Asset-backed Canadian commercial paper conduit facility - USD ($) $ in Thousands	3 Months Ended
	Mar. 26, 2017	Mar. 27, 2016
Variable Interest Entity [Line Items]
Transfers on finance receivables	$ 6,300	$ 6,600
Foreign Line of Credit
Variable Interest Entity [Line Items]
Proceeds on finance receivables	$ 5,500	$ 5,800