SEGMENT INFORMATION - Segment Reporting Information (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information
Revenue from contracts with customers	$ 303,116	$ 181,717	$ 853,249	$ 513,173
Operating (Loss) Income	33,515	(112,505)	46,021	(113,953)
North America
Segment Reporting Information
Revenue from contracts with customers	286,594	167,104	800,125	470,667
Operating (Loss) Income	36,117	(107,687)	56,862	(99,479)
Adjusted EBITDA	78,613	60	186,306	31,356
Europe
Segment Reporting Information
Revenue from contracts with customers	16,522	14,613	53,124	42,506
Operating (Loss) Income	(2,602)	(4,818)	(10,841)	(14,474)
Adjusted EBITDA	$ (913)	$ (2,326)	$ (4,987)	$ (8,439)

The Company's primary financial measure is Adjusted EBITDA, which is defined as operating income excluding: (1) stock-based compensation expense; (2) depreciation; and (3) acquisition-related items consisting of (i) amortization of intangible assets and impairments of goodwill and intangible assets, if applicable, and (ii) gains and losses recognized on changes in the fair value of contingent consideration arrangements. The Company believes this measure is useful for analysts and investors as this measure allows a more meaningful comparison between our performance and that of our competitors. Moreover, our management uses this measure internally to evaluate the performance of our business as a whole and our individual business segments, and this measure is one of the primary metrics by which our internal budgets are based and by which management is compensated. The above items are excluded from our Adjusted EBITDA measure because these items are non-cash in nature, and we believe that by excluding these items, Adjusted EBITDA corresponds more closely to the cash operating income generated from our business, from which capital investments are made and debt is serviced. Adjusted EBITDA has certain limitations in that it does not take into account the impact to IAC's statement of operations of certain expenses.

No definition available.

Name:	angi_AdjustedEBITDA
Namespace Prefix:	angi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration