Asset-Backed Financing - Assets And Liabilities Of Variable Interest Entities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Finance receivables
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Transfers accounts for as secured borrowings, assets, carrying amount	$ 3,114,992	$ 2,442,828
Transfers accounts for as secured borrowings, assets, allowance for loan losses, carrying amount	(158,462)	(121,667)
Finance receivables | Asset-backed securitizations | Consolidated VIEs:
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Transfers accounts for as secured borrowings, assets, carrying amount	2,558,450	2,048,194
Transfers accounts for as secured borrowings, assets, allowance for loan losses, carrying amount	(130,774)	(102,779)
Finance receivables | Asset-backed U.S. commercial paper conduit facility | Consolidated VIEs:
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Transfers accounts for as secured borrowings, assets, carrying amount	474,167	297,454
Transfers accounts for as secured borrowings, assets, allowance for loan losses, carrying amount	(24,236)	(14,898)
Finance receivables | Asset-backed Canadian commercial paper conduit facility | Unconsolidated VIEs:
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Transfers accounts for as secured borrowings, assets, carrying amount	82,375	97,180
Transfers accounts for as secured borrowings, assets, allowance for loan losses, carrying amount	(3,452)	(3,990)
Restricted cash
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Transfers accounts for as secured borrowings, assets, carrying amount	146,001	150,475
Restricted cash | Asset-backed securitizations | Consolidated VIEs:
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Transfers accounts for as secured borrowings, assets, carrying amount	114,254	123,717
Restricted cash | Asset-backed U.S. commercial paper conduit facility | Consolidated VIEs:
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Transfers accounts for as secured borrowings, assets, carrying amount	26,874	20,567
Restricted cash | Asset-backed Canadian commercial paper conduit facility | Unconsolidated VIEs:
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Transfers accounts for as secured borrowings, assets, carrying amount	4,873	6,191
Other assets
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Transfers accounts for as secured borrowings, assets, carrying amount	9,935	3,121
Other assets | Asset-backed securitizations | Consolidated VIEs:
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Transfers accounts for as secured borrowings, assets, carrying amount	7,899	2,328
Other assets | Asset-backed U.S. commercial paper conduit facility | Consolidated VIEs:
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Transfers accounts for as secured borrowings, assets, carrying amount	1,906	654
Other assets | Asset-backed Canadian commercial paper conduit facility | Unconsolidated VIEs:
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Transfers accounts for as secured borrowings, assets, carrying amount	130	139
Total assets
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Transfers accounts for as secured borrowings, assets, carrying amount	3,112,466	2,474,757
Total assets | Asset-backed securitizations | Consolidated VIEs:
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Transfers accounts for as secured borrowings, assets, carrying amount	2,549,829	2,071,460
Total assets | Asset-backed U.S. commercial paper conduit facility | Consolidated VIEs:
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Transfers accounts for as secured borrowings, assets, carrying amount	478,711	303,777
Total assets | Asset-backed Canadian commercial paper conduit facility | Unconsolidated VIEs:
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Transfers accounts for as secured borrowings, assets, carrying amount	83,926	99,520
Asset-backed debt
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Transfers accounts for as secured borrowings, liabilities, carrying amount	2,516,993	1,984,785
Asset-backed debt | Asset-backed securitizations | Consolidated VIEs:
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Transfers accounts for as secured borrowings, liabilities, carrying amount	2,019,414	1,627,142
Asset-backed debt | Asset-backed U.S. commercial paper conduit facility | Consolidated VIEs:
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Transfers accounts for as secured borrowings, liabilities, carrying amount	425,794	272,589
Asset-backed debt | Asset-backed Canadian commercial paper conduit facility | Unconsolidated VIEs:
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Transfers accounts for as secured borrowings, liabilities, carrying amount	$ 71,785	$ 85,054