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ORGANIZATION - Narrative (Details) professional in Thousands, project in Millions	12 Months Ended
	Dec. 31, 2020 project professional category segment	Dec. 31, 2019	Dec. 31, 2018
Noncontrolling Interest [Line Items]
Number of service categories	500
Number of service professionals (more than) | professional	240
Number of projects (more than) | project	32
Number of operating segments | segment	2
United States | Geographic Concentration Risk
Noncontrolling Interest [Line Items]
Revenue concentration risk percentage (greater than)	95.00%
United States | Revenue Benchmark | Geographic Concentration Risk
Noncontrolling Interest [Line Items]
Revenue concentration risk percentage (greater than)	10.00%	10.00%	10.00%
Angie's List
Noncontrolling Interest [Line Items]
Number of service categories	700
ANGI Homeservices | Class B Common Stock | IAC
Noncontrolling Interest [Line Items]
Ownership interest (as a percent)	84.30%
Voting interest (as a percent)	98.20%

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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