| Cover Document | Apr. 14, 2020 |
| Cover page | |
| Document Type | 8-K |
| Document Period End Date | Apr. 14, 2020 |
| Entity Registrant Name | LendingTree, Inc. |
| City Area Code | 704 |
| Local Phone Number | 541-5351 |
| Written Communications | false |
| Entity Central Index Key | 0001434621 |
| Title of 12(b) Security | Common Stock, $0.01 par value per share |
| Entity Address, Address Line One | 11115 Rushmore Drive |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-34063 |
| Entity Tax Identification Number | 26-2414818 |
| Entity Address, City or Town | Charlotte |
| Entity Address, State or Province | NC |
| Entity Address, Postal Zip Code | 28277 |
| Trading Symbol | TREE |
| Security Exchange Name | NASDAQ |
| Amendment Flag | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
