Asset-Backed Financing (Schedule of Loans Acquired in Transfer Not Accounted For as Debt Securities) (Detail) - Secured Debt - USD ($)	3 Months Ended
	Mar. 31, 2019	Apr. 01, 2018
SPEs | Asset-Backed U.S. Commercial Paper Conduit Facility VIE | U.S. Line of Credit
Variable Interest Entity
Transfers on finance receivables	$ 0	$ 32,900,000
Proceeds on finance receivables		29,300,000
Variable Interest Entity, Not Primary Beneficiary | Asset-backed Canadian commercial paper conduit facility | Foreign Line of Credit
Variable Interest Entity
Transfers on finance receivables	$ 0	7,600,000
Proceeds on finance receivables		$ 6,200,000