Fair Value of Financial Instruments (Summary of Fair Value And Carrying Value of Company Financial Instruments) (Detail) - USD ($) $ in Thousands	Jun. 26, 2016	Dec. 31, 2015	Jun. 28, 2015
Fair Value
Assets:
Cash equivalents	$ 864,670	$ 722,209	$ 1,247,579
Marketable securities	42,721	81,448	90,214
Derivatives	9,528	16,235	26,501
Finance receivables, net	7,369,410	6,937,053	7,251,671
Restricted cash	92,650	110,642	162,211
Liabilities:
Derivatives	1,605	1,300	986
Fair Value | Secured Debt | Asset-backed Canadian commercial paper conduit facility
Liabilities:
Long-term debt, fair value	161,626	153,839	160,940
Fair Value | Secured Debt | Term asset-backed securitization debt
Liabilities:
Long-term debt, fair value	1,080,416	1,455,776	2,016,232
Fair Value | Medium-term notes
Liabilities:
Long-term debt, fair value	4,239,390	3,410,966	4,077,952
Fair Value | Senior unsecured notes
Liabilities:
Long-term debt, fair value	808,227	737,435	0
Carrying Value
Assets:
Cash equivalents	864,670	722,209	1,247,579
Marketable securities	42,721	81,448	90,214
Derivatives	9,528	16,235	26,501
Finance receivables, net	7,282,045	6,868,153	7,148,495
Restricted cash	92,650	110,642	162,211
Liabilities:
Derivatives	1,605	1,300	986
Carrying Value | Commercial Paper
Liabilities:
Short-term debt, fair value	1,020,487	1,201,380	114,983
Carrying Value | Secured Debt | Asset-backed Canadian commercial paper conduit facility
Liabilities:
Long-term debt, fair value	161,626	153,839	160,940
Carrying Value | Secured Debt | Term asset-backed securitization debt
Liabilities:
Long-term debt, fair value	1,074,931	1,459,377	2,011,461
Carrying Value | Medium-term notes
Liabilities:
Long-term debt, fair value	4,063,297	3,316,949	3,923,638
Carrying Value | Senior unsecured notes
Liabilities:
Long-term debt, fair value	$ 740,982	$ 740,653	$ 0