Fair Value - Summary of Fair Value and Carrying Value of Company Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Estimate of Fair Value Measurement
Assets:
Finance receivables, net	$ 7,500,263	$ 7,248,353
Liabilities:
Deposits, net	460,766	339,981
Estimate of Fair Value Measurement \| Secured Debt \| Asset-backed U.S. commercial paper conduit facility
Debt:
Long-term debt, fair value	233,258	425,794
Estimate of Fair Value Measurement \| Secured Debt \| Asset-backed Canadian commercial paper conduit facility
Debt:
Long-term debt, fair value	70,742	71,785
Estimate of Fair Value Measurement \| Secured Debt \| Asset-backed securitization debt
Debt:
Long-term debt, fair value	1,872,215	1,996,550
Estimate of Fair Value Measurement \| Medium-term Notes
Debt:
Long-term debt, fair value	3,308,952	2,760,093
Estimate of Fair Value Measurement \| Senior Notes
Debt:
Long-term debt, fair value	674,787	661,630
Estimate of Fair Value Measurement \| Unsecured commercial paper
Debt:
Short-term debt, fair value	878,935	770,468
Carrying Value
Assets:
Finance receivables, net	7,498,265	7,138,438
Liabilities:
Deposits, net	447,782	317,375
Carrying Value \| Secured Debt \| Asset-backed U.S. commercial paper conduit facility
Debt:
Long-term debt, fair value	233,258	425,794
Carrying Value \| Secured Debt \| Asset-backed Canadian commercial paper conduit facility
Debt:
Long-term debt, fair value	70,742	71,785
Carrying Value \| Secured Debt \| Asset-backed securitization debt
Debt:
Long-term debt, fair value	1,877,368	2,019,414
Carrying Value \| Medium-term Notes
Debt:
Long-term debt, fair value	3,319,138	2,879,473
Carrying Value \| Senior Notes
Debt:
Long-term debt, fair value	746,079	745,368
Carrying Value \| Unsecured commercial paper
Debt:
Short-term debt, fair value	$ 878,935	$ 770,468

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
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 69B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481568/470-20-55-69B

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 69C
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481568/470-20-55-69C

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1D
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1D

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482907/825-10-50-10

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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
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482907/825-10-50-10

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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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