| Document And Entity Information | Dec. 06, 2023 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Dec. 06, 2023 |
| Entity Registrant Name | ENOVA INTERNATIONAL, INC. |
| Entity Central Index Key | 0001529864 |
| Entity Emerging Growth Company | false |
| Entity File Number | 1-35503 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 45-3190813 |
| Entity Address, Address Line One | 175 West Jackson Boulevard |
| Entity Address, City or Town | Chicago |
| Entity Address, State or Province | IL |
| Entity Address, Postal Zip Code | 60604 |
| City Area Code | 312 |
| Local Phone Number | 568-4200 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $.00001 par value per share |
| Trading Symbol | ENVA |
| Security Exchange Name | NYSE |
