Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2019	Jan. 31, 2020	Jun. 30, 2019
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2019
Document Transition Report	false
Entity File Number	001-38220
Entity Registrant Name	ANGI HOMESERVICES INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	82-1204801
Entity Address, Address Line One	3601 Walnut Street
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
Title of 12(b) Security	Class A Common Stock, par value $0.001
Trading Symbol	ANGI
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 1,109,210,119
Entity Central Index Key	0001705110
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Amendment Flag	false
Class A Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		79,566,380
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		421,569,641
Class C Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		0