Fair Value of Financial Instruments (Summary of Fair Value And Carrying Value of Company Financial Instruments) (Detail) - USD ($) $ in Thousands	Sep. 24, 2017	Dec. 31, 2016	Sep. 25, 2016
Fair Value
Assets:
Cash equivalents	$ 683,134	$ 759,984	$ 790,284
Marketable securities	45,726	43,638	44,101
Derivatives	724	29,034	6,606
Finance receivables, net	7,159,632	6,921,037	7,233,923
Restricted cash	63,380	67,147	79,661
Liabilities:
Derivatives	32,414	142	1,388
Fair Value \| Secured Debt \| Asset-Backed U.S. Commercial Paper Conduit Facility VIE [Member]
Liabilities:
Long-term debt, fair value	280,308	0	0
Fair Value \| Secured Debt \| Asset-backed Canadian commercial paper conduit facility
Liabilities:
Long-term debt, fair value	122,130	149,338	140,488
Fair Value \| Secured Debt \| Asset-backed securitization debt
Liabilities:
Long-term debt, fair value	430,038	797,688	929,775
Fair Value \| Medium-term notes
Liabilities:
Long-term debt, fair value	4,612,083	4,139,462	4,199,753
Fair Value \| Senior unsecured notes
Liabilities:
Long-term debt, fair value	774,693	744,552	800,818
Carrying Value
Assets:
Cash equivalents	683,134	759,984	790,284
Marketable securities	45,726	43,638	44,101
Derivatives	724	29,034	6,606
Finance receivables, net	7,101,025	6,835,458	7,149,966
Restricted cash	63,380	67,147	79,661
Liabilities:
Derivatives	32,414	142	1,388
Carrying Value \| Commercial Paper
Liabilities:
Short-term debt, fair value	834,875	1,055,708	1,055,428
Carrying Value \| Secured Debt \| Asset-Backed U.S. Commercial Paper Conduit Facility VIE [Member]
Liabilities:
Long-term debt, fair value	280,308	0	0
Carrying Value \| Secured Debt \| Asset-backed Canadian commercial paper conduit facility
Liabilities:
Long-term debt, fair value	122,130	149,338	140,488
Carrying Value \| Secured Debt \| Asset-backed securitization debt
Liabilities:
Long-term debt, fair value	429,833	796,275	925,619
Carrying Value \| Medium-term notes
Liabilities:
Long-term debt, fair value	4,564,124	4,064,940	4,063,510
Carrying Value \| Senior unsecured notes
Liabilities:
Long-term debt, fair value	$ 741,797	$ 741,306	$ 741,144

Restricted Cash and Cash Equivalents, Fair Value Disclosure

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Fair value portion of an agreement for an unconditional promise by the maker to pay the holder a definite sum of money at a future date.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of short-term debt existing as of the balance sheet date.

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