Fair Value of Financial Instruments (Summary of Fair Value And Carrying Value of Company Financial Instruments) (Detail) - USD ($) $ in Thousands	Sep. 25, 2016	Dec. 31, 2015	Sep. 27, 2015
Fair Value
Assets:
Cash equivalents	$ 790,284	$ 722,209	$ 1,368,554
Marketable securities	44,101	81,448	82,616
Derivatives	6,606	16,235	18,015
Finance receivables, net	7,233,923	6,937,053	7,170,873
Restricted cash	79,661	110,642	137,217
Liabilities:
Derivatives	1,388	1,300	1,309
Fair Value | Secured Debt | Asset-backed Canadian commercial paper conduit facility
Liabilities:
Long-term debt, fair value	140,488	153,839	158,712
Fair Value | Secured Debt | Term asset-backed securitization debt
Liabilities:
Long-term debt, fair value	929,775	1,455,776	1,707,076
Fair Value | Medium-term notes
Liabilities:
Long-term debt, fair value	4,199,753	3,410,966	3,468,459
Fair Value | Senior unsecured notes
Liabilities:
Long-term debt, fair value	800,818	737,435	752,494
Carrying Value
Assets:
Cash equivalents	790,284	722,209	1,368,554
Marketable securities	44,101	81,448	82,616
Derivatives	6,606	16,235	18,015
Finance receivables, net	7,149,966	6,868,153	7,078,346
Restricted cash	79,661	110,642	137,217
Liabilities:
Derivatives	1,388	1,300	1,309
Carrying Value | Commercial Paper
Liabilities:
Short-term debt, fair value	1,055,428	1,201,380	990,049
Carrying Value | Secured Debt | Asset-backed Canadian commercial paper conduit facility
Liabilities:
Long-term debt, fair value	140,488	153,839	158,712
Carrying Value | Secured Debt | Term asset-backed securitization debt
Liabilities:
Long-term debt, fair value	925,619	1,459,377	1,701,732
Carrying Value | Medium-term notes
Liabilities:
Long-term debt, fair value	4,063,510	3,316,949	3,325,032
Carrying Value | Senior unsecured notes
Liabilities:
Long-term debt, fair value	$ 741,144	$ 740,653	$ 741,057