Fair Value - Summary of Fair Value and Carrying Value of Company Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jul. 01, 2018
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Finance receivables, net	$ 7,672,939	$ 7,304,334	$ 7,375,644
Fair Value \| Medium-term notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt Instrument, Fair Value Disclosure	4,719,053	4,829,671	4,398,478
Fair Value \| Senior unsecured notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt Instrument, Fair Value Disclosure	756,243	707,198	719,152
Fair Value \| Asset-backed U.S. commercial paper conduit facilities \| Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt Instrument, Fair Value Disclosure	464,136	582,717	300,000
Fair Value \| Asset-backed Canadian commercial paper conduit facility \| Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt Instrument, Fair Value Disclosure	148,740	155,951	166,638
Fair Value \| Asset-backed securitization debt \| Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt Instrument, Fair Value Disclosure	1,007,205	94,974	168,941
Fair Value \| Unsecured commercial paper
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Short-term Debt, Fair Value	405,695	1,135,810	1,327,307
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Finance receivables, net	7,594,405	7,221,931	7,313,202
Carrying Value \| Medium-term notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt Instrument, Fair Value Disclosure	4,687,660	4,887,007	4,435,449
Carrying Value \| Senior unsecured notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt Instrument, Fair Value Disclosure	742,959	742,624	742,292
Carrying Value \| Asset-backed U.S. commercial paper conduit facilities \| Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt Instrument, Fair Value Disclosure	464,136	582,717	300,000
Carrying Value \| Asset-backed Canadian commercial paper conduit facility \| Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt Instrument, Fair Value Disclosure	148,740	155,951	166,638
Carrying Value \| Asset-backed securitization debt \| Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt Instrument, Fair Value Disclosure	1,002,869	95,167	169,430
Carrying Value \| Unsecured commercial paper
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Short-term Debt, Fair Value	$ 405,695	$ 1,135,810	$ 1,327,307

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=118260190&loc=d3e13433-108611

+ Details

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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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- 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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- 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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- Details

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