Fair Value - Summary of Fair Value and Carrying Value of Company Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Estimate of Fair Value Measurement
Assets:
Finance receivables, net	$ 7,248,353	$ 6,794,499
Liabilities:
Deposits, net	339,981	293,602
Estimate of Fair Value Measurement \| Secured Debt \| Asset-backed U.S. commercial paper conduit facility
Debt:
Long-term debt, fair value	425,794	272,589
Estimate of Fair Value Measurement \| Secured Debt \| Asset-backed Canadian commercial paper conduit facility
Debt:
Long-term debt, fair value	71,785	85,054
Estimate of Fair Value Measurement \| Secured Debt \| Asset-backed securitization debt
Debt:
Long-term debt, fair value	1,996,550	1,633,749
Estimate of Fair Value Measurement \| Medium-term Notes
Debt:
Long-term debt, fair value	2,760,093	3,513,815
Estimate of Fair Value Measurement \| Senior Notes
Debt:
Long-term debt, fair value	661,630	790,373
Estimate of Fair Value Measurement \| Unsecured commercial paper
Debt:
Short-term debt, fair value	770,468	751,286
Carrying Value
Assets:
Finance receivables, net	7,138,438	6,571,921
Liabilities:
Deposits, net	317,375	290,326
Carrying Value \| Secured Debt \| Asset-backed U.S. commercial paper conduit facility
Debt:
Long-term debt, fair value	425,794	272,589
Carrying Value \| Secured Debt \| Asset-backed Canadian commercial paper conduit facility
Debt:
Long-term debt, fair value	71,785	85,054
Carrying Value \| Secured Debt \| Asset-backed securitization debt
Debt:
Long-term debt, fair value	2,019,414	1,627,142
Carrying Value \| Medium-term Notes
Debt:
Long-term debt, fair value	2,879,473	3,408,660
Carrying Value \| Senior Notes
Debt:
Long-term debt, fair value	745,368	744,668
Carrying Value \| Unsecured commercial paper
Debt:
Short-term debt, fair value	$ 770,468	$ 751,286

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/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
-Paragraph 69C
-URI https://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
-Paragraph 69B
-URI https://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1D
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611

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- References

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- Definition

Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

+ References

No definition available.

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- References

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- References

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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://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611

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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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