Fair Value of Financial Instruments (Summary of Fair Value And Carrying Value of Company Financial Instruments) (Detail) - USD ($) $ in Thousands	Jun. 25, 2017	Dec. 31, 2016	Jun. 26, 2016
Fair Value
Assets:
Cash equivalents	$ 988,476	$ 759,984	$ 864,670
Marketable securities	44,156	43,638	42,721
Derivatives	458	29,034	9,528
Finance receivables, net	7,401,974	6,921,037	7,369,410
Restricted cash	74,395	67,147	92,650
Liabilities:
Derivatives	4,865	142	1,605
Fair Value \| Secured Debt \| Asset-Backed U.S. Commercial Paper Conduit Facility VIE [Member]
Liabilities:
Long-term debt, fair value	279,833	0	0
Fair Value \| Secured Debt \| Asset-backed Canadian commercial paper conduit facility
Liabilities:
Long-term debt, fair value	138,739	149,338	161,626
Fair Value \| Secured Debt \| Asset-backed securitization debt
Liabilities:
Long-term debt, fair value	521,956	797,688	1,080,416
Fair Value \| Medium-term notes
Liabilities:
Long-term debt, fair value	4,623,146	4,139,462	4,239,390
Fair Value \| Senior unsecured notes
Liabilities:
Long-term debt, fair value	773,084	744,552	808,227
Carrying Value
Assets:
Cash equivalents	988,476	759,984	864,670
Marketable securities	44,156	43,638	42,721
Derivatives	458	29,034	9,528
Finance receivables, net	7,332,535	6,835,458	7,282,045
Restricted cash	74,395	67,147	92,650
Liabilities:
Derivatives	4,865	142	1,605
Carrying Value \| Commercial Paper
Liabilities:
Short-term debt, fair value	928,445	1,055,708	1,020,487
Carrying Value \| Secured Debt \| Asset-Backed U.S. Commercial Paper Conduit Facility VIE [Member]
Liabilities:
Long-term debt, fair value	279,833	0	0
Carrying Value \| Secured Debt \| Asset-backed Canadian commercial paper conduit facility
Liabilities:
Long-term debt, fair value	138,739	149,338	161,626
Carrying Value \| Secured Debt \| Asset-backed securitization debt
Liabilities:
Long-term debt, fair value	521,300	796,275	1,074,931
Carrying Value \| Medium-term notes
Liabilities:
Long-term debt, fair value	4,562,403	4,064,940	4,063,297
Carrying Value \| Senior unsecured notes
Liabilities:
Long-term debt, fair value	$ 741,633	$ 741,306	$ 740,982

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.

+ References

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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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