| Cover | Jan. 18, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jan. 18, 2022 |
| Entity File Number | 001-34063 |
| Entity Registrant Name | LendingTree, Inc. |
| Entity Central Index Key | 0001434621 |
| Entity Tax Identification Number | 26-2414818 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 1415 Vantage Park Dr., |
| Entity Address, Address Line Two | Suite 700 |
| Entity Address, City or Town | Charlotte |
| Entity Address, State or Province | NC |
| Entity Address, Postal Zip Code | 28203 |
| City Area Code | 704 |
| Local Phone Number | 541-5351 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $0.01 par value per share |
| Trading Symbol | TREE |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
