CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Total Angi Inc. Shareholders' Equity	Redeemable Noncontrolling Interests	Common Stock Class A Common Stock	Common Stock Class B Common Stock	Additional Paid-in Capital	(Accumulated Deficit) Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Noncontrolling Interests
Balance at beginning of period at Dec. 31, 2019			$ 26,663
Increase (Decrease) in Redeemable Noncontrolling Interests
Net (loss) earnings			383
Other comprehensive loss			233
Stock-based compensation expense			15
Purchase of redeemable noncontrolling interests			(3,165)
Adjustment of redeemable noncontrolling interests to fair value			1,645
Balance at end of period at Sep. 30, 2020			25,774
Balance at beginning of period at Dec. 31, 2019	$ 1,323,552	$ 1,314,288		$ 87	$ 422	$ 1,357,075	$ 16,032	$ (1,379)	$ (57,949)	$ 9,264
Balance at beginning of period (shares) at Dec. 31, 2019				87,007,000	421,570,000
Increase (Decrease) in Shareholders' Equity
Net (loss) earnings	8,847	8,181					8,181			666
Other comprehensive loss	738	394						394		344
Stock-based compensation expense	54,664	54,664				54,664
Issuance of common stock pursuant to stock-based awards, net of withholding taxes	(48,609)	(48,609)		$ 6		(48,615)
Issuance of common stock pursuant to stock-based awards, net of withholding taxes (shares)				5,653,000
Issuance of common stock to IAC pursuant to the employee matters agreement	(1,423)	(1,423)				(1,423)
Issuance of common stock to IAC pursuant to the employee matters agreement (shares)					289,000
Purchase of treasury stock	(54,859)	(54,859)							(54,859)
Purchase of noncontrolling interests	(1,115)									(1,115)
Adjustment of redeemable noncontrolling interests to fair value	(1,645)	(1,645)				(1,645)
Adjustment pursuant to the tax sharing agreement	3,613	3,613				3,613
Other	(2)	(692)				(692)				690
Balance at end of period at Sep. 30, 2020	1,283,761	1,273,912		$ 93	$ 422	1,362,977	24,213	(985)	(112,808)	9,849
Balance at end of period (shares) at Sep. 30, 2020				92,660,000	421,859,000
Balance at beginning of period at Jun. 30, 2020			25,093
Increase (Decrease) in Redeemable Noncontrolling Interests
Net (loss) earnings			438
Other comprehensive loss			920
Adjustment of redeemable noncontrolling interests to fair value			(677)
Balance at end of period at Sep. 30, 2020			25,774
Balance at beginning of period at Jun. 30, 2020	1,301,926	1,292,322		$ 89	$ 422	1,387,618	19,741	(2,740)	(112,808)	9,604
Balance at beginning of period (shares) at Jun. 30, 2020				89,076,000	421,757,000
Increase (Decrease) in Shareholders' Equity
Net (loss) earnings	4,765	4,472					4,472			293
Other comprehensive loss	2,133	1,755						1,755		378
Stock-based compensation expense	13,846	13,846				13,846
Issuance of common stock pursuant to stock-based awards, net of withholding taxes	(37,838)	(37,838)		$ 4		(37,842)
Issuance of common stock pursuant to stock-based awards, net of withholding taxes (shares)				3,584,000
Issuance of common stock to IAC pursuant to the employee matters agreement	(632)	(632)				(632)
Issuance of common stock to IAC pursuant to the employee matters agreement (shares)					102,000
Purchase of noncontrolling interests	(1,115)									(1,115)
Adjustment of redeemable noncontrolling interests to fair value	677	677				677
Other	(1)	(690)				(690)				689
Balance at end of period at Sep. 30, 2020	1,283,761	1,273,912		$ 93	$ 422	1,362,977	24,213	(985)	(112,808)	9,849
Balance at end of period (shares) at Sep. 30, 2020				92,660,000	421,859,000
Balance at beginning of period at Dec. 31, 2020	26,364		26,364
Increase (Decrease) in Redeemable Noncontrolling Interests
Net (loss) earnings			49
Other comprehensive loss			515
Purchase of redeemable noncontrolling interests			(22,938)
Adjustment of redeemable noncontrolling interests to fair value			534
Balance at end of period at Sep. 30, 2021	4,524		4,524
Balance at beginning of period at Dec. 31, 2020	1,282,857	1,272,290		$ 94	$ 422	1,379,469	9,749	4,637	(122,081)	10,567
Balance at beginning of period (shares) at Dec. 31, 2020				94,238,000	421,862,000
Increase (Decrease) in Shareholders' Equity
Net (loss) earnings	(44,780)	(45,357)					(45,357)			577
Other comprehensive loss	207	296						296		(89)
Stock-based compensation expense	22,836	22,836				22,836
Issuance of common stock pursuant to stock-based awards, net of withholding taxes	(55,807)	(55,807)		$ 2		(55,809)
Issuance of common stock pursuant to stock-based awards, net of withholding taxes (shares)				2,427,000
Issuance of common stock to IAC pursuant to the employee matters agreement	0			$ 3		(3)
Issuance of common stock to IAC pursuant to the employee matters agreement (shares)				2,588,000	157,000
Purchase of treasury stock	(35,403)	(35,403)							(35,403)
Purchase of noncontrolling interests	(160)									(160)
Adjustment of redeemable noncontrolling interests to fair value	(534)	(534)				(534)
Other	(410)	(410)				(410)
Balance at end of period at Sep. 30, 2021	1,168,806	1,157,911		$ 99	$ 422	1,345,549	(35,608)	4,933	(157,484)	10,895
Balance at end of period (shares) at Sep. 30, 2021				99,253,000	422,019,000
Balance at beginning of period at Jun. 30, 2021			4,536
Increase (Decrease) in Redeemable Noncontrolling Interests
Net (loss) earnings			61
Other comprehensive loss			(73)
Balance at end of period at Sep. 30, 2021	4,524		$ 4,524
Balance at beginning of period at Jun. 30, 2021	1,209,425	1,198,371		$ 99	$ 422	1,338,208	(18,613)	5,973	(127,718)	11,054
Balance at beginning of period (shares) at Jun. 30, 2021				99,111,000	421,977,000
Increase (Decrease) in Shareholders' Equity
Net (loss) earnings	(16,754)	(16,995)					(16,995)			241
Other comprehensive loss	(1,280)	(1,040)						(1,040)		(240)
Stock-based compensation expense	8,817	8,817				8,817
Issuance of common stock pursuant to stock-based awards, net of withholding taxes	(1,066)	(1,066)				(1,066)
Issuance of common stock pursuant to stock-based awards, net of withholding taxes (shares)				139,000
Issuance of common stock to IAC pursuant to the employee matters agreement	0
Issuance of common stock to IAC pursuant to the employee matters agreement (shares)				3,000	42,000
Purchase of treasury stock	(29,766)	(29,766)							(29,766)
Purchase of noncontrolling interests	(160)									(160)
Other	(410)	(410)				(410)
Balance at end of period at Sep. 30, 2021	$ 1,168,806	$ 1,157,911		$ 99	$ 422	$ 1,345,549	$ (35,608)	$ 4,933	$ (157,484)	$ 10,895
Balance at end of period (shares) at Sep. 30, 2021				99,253,000	422,019,000