Fair Value Fair Value (Summary of Fair Value and Carrying Value of Company Financial Instruments) (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Apr. 01, 2018
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Finance receivables, net	$ 7,520,418	$ 7,304,334	$ 7,195,908
Fair Value \| Medium-term notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt Instrument, Fair Value Disclosure	4,675,767	4,829,671	4,486,399
Fair Value \| Senior unsecured notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt Instrument, Fair Value Disclosure	719,544	707,198	750,440
Fair Value \| Asset-Backed U.S. Commercial Paper Conduit Facility VIE \| Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt Instrument, Fair Value Disclosure	526,947	582,717	281,311
Fair Value \| Asset-backed Canadian commercial paper conduit facility \| Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt Instrument, Fair Value Disclosure	142,676	155,951	158,162
Fair Value \| Asset-backed securitization debt \| Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt Instrument, Fair Value Disclosure	18,674	94,974	283,591
Fair Value \| Commercial Paper
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Short-term Debt, Fair Value	1,192,925	1,135,810	1,036,976
Reported Value Measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Finance receivables, net	7,438,592	7,221,931	7,126,442
Reported Value Measurement \| Medium-term notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt Instrument, Fair Value Disclosure	4,685,636	4,887,007	4,514,798
Reported Value Measurement \| Senior unsecured notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt Instrument, Fair Value Disclosure	742,791	742,624	742,126
Reported Value Measurement \| Asset-Backed U.S. Commercial Paper Conduit Facility VIE \| Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt Instrument, Fair Value Disclosure	526,947	582,717	281,311
Reported Value Measurement \| Asset-backed Canadian commercial paper conduit facility \| Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt Instrument, Fair Value Disclosure	142,676	155,951	158,162
Reported Value Measurement \| Asset-backed securitization debt \| Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt Instrument, Fair Value Disclosure	18,694	95,167	284,793
Reported Value Measurement \| Commercial Paper
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Short-term Debt, Fair Value	$ 1,192,925	$ 1,135,810	$ 1,036,976

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.3(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Balance Type:	debit
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- Definition

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.

+ References

No definition available.

+ Details

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