Variable Interest Entities and Securitizations - Summary of Total Assets and Total Liabilities Associated With Variable Interests in Consolidated VIEs (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current Assets:
Restricted cash	$ 196,809	$ 82,450
Finance receivables at fair value, current	14,900
Total current assets	1,859,427	2,102,292
Finance receivables at fair value, noncurrent	210,523
Total assets	2,338,735	2,366,750
Current Liabilities:
Current portion of securitization debt	138,935
Total current liabilities	1,017,329	827,256
Securitization debt, net of current portion	687,426	610,618
Total liabilities	1,730,371	$ 1,451,556
Securitization Vehicles
Current Assets:
Restricted cash	25,542
Finance receivables at fair value, current	12,116
Total current assets	37,658
Finance receivables at fair value, noncurrent	177,353
Total assets	215,011
Current Liabilities:
Current portion of securitization debt	138,935
Securitization debt, net of current portion	65,692
Total liabilities	$ 204,627