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SEGMENT INFORMATION - Revenue Disaggregated by Service (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Revenue	$ 1,246,874	$ 1,104,592	$ 3,539,375	$ 3,158,789
Operating segments | Match Group
Segment Reporting Information [Line Items]
Revenue	541,493	443,943	1,504,091	1,272,506
Operating segments | ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	357,358	303,116	1,004,697	853,249
Operating segments | Vimeo
Segment Reporting Information [Line Items]
Revenue	52,145	40,304	141,439	115,432
Operating segments | Dotdash
Segment Reporting Information [Line Items]
Revenue	40,285	30,053	111,974	90,841
Operating segments | Applications
Segment Reporting Information [Line Items]
Revenue	126,071	153,973	402,557	429,034
Operating segments | Applications | Mosaic Group
Segment Reporting Information [Line Items]
Revenue	51,203	35,431	146,864	78,474
Operating segments | Emerging & Other
Segment Reporting Information [Line Items]
Revenue	129,581	133,345	374,871	398,026
North America | Operating segments | ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	339,144	286,594	945,538	800,125
International
Segment Reporting Information [Line Items]
Revenue	439,686	365,993	1,245,711	1,054,039
Europe | Operating segments | ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	18,214	16,522	59,159	53,124
Direct revenue | Operating segments | Match Group
Segment Reporting Information [Line Items]
Revenue	530,949	431,545	1,472,211	1,232,009
Direct revenue | North America | Operating segments | Match Group
Segment Reporting Information [Line Items]
Revenue	268,863	233,643	758,135	667,163
Direct revenue | International | Operating segments | Match Group
Segment Reporting Information [Line Items]
Revenue	262,086	197,902	714,076	564,846
Indirect revenue (principally advertising revenue) | Operating segments | Match Group
Segment Reporting Information [Line Items]
Revenue	10,544	12,398	31,880	40,497
Total Marketplace revenue | North America | Operating segments | ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	270,516	213,049	749,969	583,392
Consumer connection revenue | North America | Operating segments | ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	252,552	195,065	695,370	531,297
Membership subscription revenue | North America | Operating segments | ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	16,237	17,034	49,239	49,226
Other revenue | North America | Operating segments | ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	1,727	950	5,360	2,869
Advertising and other revenue | North America | Operating segments | ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	68,628	73,545	195,569	216,733
Advertising and other revenue | Europe | Operating segments | ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	624	283	1,859	834
Consumer connection revenue | Europe | Operating segments | ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	14,125	12,022	46,480	38,885
Membership subscription revenue | Europe | Operating segments | ANGI Homeservices
Segment Reporting Information [Line Items]
Revenue	3,465	4,217	10,820	13,405
Platform revenue | Operating segments | Vimeo
Segment Reporting Information [Line Items]
Revenue	52,145	37,245	139,160	106,470
Hardware revenue | Operating segments | Vimeo
Segment Reporting Information [Line Items]
Revenue	0	3,059	2,279	8,962
Advertising revenue | Operating segments | Dotdash
Segment Reporting Information [Line Items]
Revenue	29,158	23,949	84,171	71,714
Advertising revenue | Operating segments | Applications | Mosaic Group
Segment Reporting Information [Line Items]
Revenue	2,124	4,274	6,957	14,787
Advertising revenue | Operating segments | Emerging & Other
Segment Reporting Information [Line Items]
Revenue	113,564	105,873	330,438	317,047
Google advertising revenue | Operating segments | Emerging & Other
Segment Reporting Information [Line Items]
Revenue	101,609	84,955	303,207	266,061
Other advertising revenue | Operating segments | Emerging & Other
Segment Reporting Information [Line Items]
Revenue	11,955	20,918	27,231	50,986
Affiliate commerce commission and other revenue | Operating segments | Dotdash
Segment Reporting Information [Line Items]
Revenue	11,127	6,104	27,803	19,127
Total Desktop revenue | Operating segments | Applications
Segment Reporting Information [Line Items]
Revenue	74,868	118,542	255,693	350,560
Total advertising revenue | Operating segments | Applications
Segment Reporting Information [Line Items]
Revenue	71,255	114,271	243,584	334,205
Google advertising revenue | Operating segments | Applications
Segment Reporting Information [Line Items]
Revenue	68,076	110,855	234,211	326,982
Other advertising revenue | Operating segments | Applications
Segment Reporting Information [Line Items]
Revenue	3,179	3,416	9,373	7,223
Subscription and other revenue | Operating segments | Applications
Segment Reporting Information [Line Items]
Revenue	3,613	4,271	12,109	16,355
Subscription and other revenue | Operating segments | Applications | Mosaic Group
Segment Reporting Information [Line Items]
Revenue	49,079	31,157	139,907	63,687
Other revenue | Operating segments | Emerging & Other
Segment Reporting Information [Line Items]
Revenue	$ 16,017	$ 27,472	$ 44,433	$ 80,979

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
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-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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