| Cover | Feb. 24, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Feb. 24, 2021 |
| Entity File Number | 001-38220 |
| Entity Registrant Name | ANGI Homeservices Inc. |
| Entity Central Index Key | 0001705110 |
| Entity Tax Identification Number | 82-1204801 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 3601 Walnut Street |
| Entity Address, Address Line Two | Suite 700 |
| Entity Address, City or Town | Denver |
| Entity Address, State or Province | CO |
| Entity Address, Postal Zip Code | 80205 |
| City Area Code | 303 |
| Local Phone Number | 963-7200 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Class A Common Stock, par value $0.001 |
| Trading Symbol | ANGI |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
