Fair Value - Summary of Fair Value and Carrying Value of Company Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Fair Value
Assets:
Finance receivables, net	$ 7,927,504	$ 7,500,263	$ 7,611,579
Liabilities:
Deposits, net	454,617	460,766	391,238
Fair Value \| Medium-term notes
Debt:
Long-term debt, fair value	3,276,959	3,308,952	3,153,175
Fair Value \| Senior notes
Debt:
Long-term debt, fair value	684,792	674,787	665,665
Fair Value \| Asset-backed U.S. commercial paper conduit facility \| Secured Debt
Debt:
Long-term debt, fair value	502,521	233,258	372,816
Fair Value \| Asset-backed Canadian commercial paper conduit facility \| Secured Debt
Debt:
Long-term debt, fair value	88,333	70,742	62,195
Fair Value \| Asset-backed securitization debt \| Secured Debt
Debt:
Long-term debt, fair value	1,640,573	1,872,215	2,240,966
Fair Value \| Unsecured commercial paper
Debt:
Short-term debt, fair value	938,719	878,935	501,243
Carrying Value
Assets:
Finance receivables, net	7,906,022	7,498,265	7,573,723
Liabilities:
Deposits, net	441,168	447,782	369,311
Carrying Value \| Medium-term notes
Debt:
Long-term debt, fair value	3,288,993	3,319,138	3,245,591
Carrying Value \| Senior notes
Debt:
Long-term debt, fair value	746,258	746,079	745,545
Carrying Value \| Asset-backed U.S. commercial paper conduit facility \| Secured Debt
Debt:
Long-term debt, fair value	502,521	233,258	372,816
Carrying Value \| Asset-backed Canadian commercial paper conduit facility \| Secured Debt
Debt:
Long-term debt, fair value	88,333	70,742	62,195
Carrying Value \| Asset-backed securitization debt \| Secured Debt
Debt:
Long-term debt, fair value	1,644,626	1,877,368	2,257,799
Carrying Value \| Unsecured commercial paper
Debt:
Short-term debt, fair value	$ 938,719	$ 878,935	$ 501,243

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- Definition

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

+ References

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

No definition available.

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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

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://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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