Fair Value Fair Value (Summary of Fair Value and Carrying Value of Company Financial Instruments) (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Estimate of Fair Value Measurement
Assets:
Finance receivables, net	$ 7,304,334	$ 7,021,549
Estimate of Fair Value Measurement \| Secured Debt \| Asset-Backed U.S. Commercial Paper Conduit Facility VIE
Liabilities:
Debt instrument, fair value	582,717	279,457
Estimate of Fair Value Measurement \| Secured Debt \| Asset-backed Canadian commercial paper conduit facility
Liabilities:
Debt instrument, fair value	155,951	174,779
Estimate of Fair Value Measurement \| Secured Debt \| Term asset-backed securitization debt, VIE
Liabilities:
Debt instrument, fair value	94,974	351,767
Estimate of Fair Value Measurement \| Medium-term Notes
Liabilities:
Debt instrument, fair value	4,829,671	4,189,092
Estimate of Fair Value Measurement \| Senior Notes
Liabilities:
Debt instrument, fair value	707,198	784,433
Estimate of Fair Value Measurement \| Unsecured Commercial Paper
Liabilities:
Unsecured commercial paper	1,135,810	1,273,482
Carrying Value
Assets:
Finance receivables, net	7,221,931	6,965,086
Carrying Value \| Secured Debt \| Asset-Backed U.S. Commercial Paper Conduit Facility VIE
Liabilities:
Debt instrument, fair value	582,717	279,457
Carrying Value \| Secured Debt \| Asset-backed Canadian commercial paper conduit facility
Liabilities:
Debt instrument, fair value	155,951	174,779
Carrying Value \| Secured Debt \| Term asset-backed securitization debt, VIE
Liabilities:
Debt instrument, fair value	95,167	352,624
Carrying Value \| Medium-term Notes
Liabilities:
Debt instrument, fair value	4,887,007	4,165,706
Carrying Value \| Senior Notes
Liabilities:
Debt instrument, fair value	742,624	741,961
Carrying Value \| Unsecured Commercial Paper
Liabilities:
Unsecured commercial paper	$ 1,135,810	$ 1,273,482

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

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Period Type:	instant

- References

No definition available.

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- References

No definition available.

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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.

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