Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

+ Details

Name:	us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_BusinessAcquisitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472

+ Details

Name:	us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

+ References

No definition available.

+ Details

Name:	us-gaap_FinitelivedIntangibleAssetsAcquired1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of increase in assets, excluding financial assets and goodwill, lacking physical substance with an indefinite life, from an acquisition.

+ References

No definition available.

+ Details

Name:	us-gaap_IndefinitelivedIntangibleAssetsAcquired
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_BusinessAcquisitionAxis=angi_AngiesListMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=angi_ServiceProvidersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_DevelopedTechnologyRightsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_CustomerRelationshipsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_CustomerListsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=angi_HomeStarsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=angi_ContractorRelationshipsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=angi_MyBuilderMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=angi_MyHammerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_TrademarksAndTradeNamesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

BUSINESS COMBINATIONS - INTANGIBLE ASSETS ACQUIRED AS PART OF BUSINESS COMBINATION (Details) - USD ($) $ in Thousands	Sep. 29, 2017	Mar. 24, 2017	Feb. 08, 2017	Nov. 03, 2016
Angie's List
Business Acquisition
Total identifiable intangible assets acquired	$ 317,300
Angie's List \| Service professionals
Business Acquisition
Finite-lived intangible assets acquired	$ 90,500
Weighted-average useful life (years)	3 years
Angie's List \| Developed technology
Business Acquisition
Finite-lived intangible assets acquired	$ 63,900
Weighted-average useful life (years)	6 years
Angie's List \| Memberships
Business Acquisition
Finite-lived intangible assets acquired	$ 15,900
Weighted-average useful life (years)	3 years
Angie's List \| User base
Business Acquisition
Finite-lived intangible assets acquired	$ 10,000
Weighted-average useful life (years)	1 year
HomeStars
Business Acquisition
Total identifiable intangible assets acquired			$ 6,414
HomeStars \| Developed technology
Business Acquisition
Finite-lived intangible assets acquired			$ 1,522
Weighted-average useful life (years)			2 years
HomeStars \| User base
Business Acquisition
Finite-lived intangible assets acquired			$ 99
Weighted-average useful life (years)			1 year
HomeStars \| Contractor relationships
Business Acquisition
Finite-lived intangible assets acquired			$ 2,435
Weighted-average useful life (years)			2 years
MyBuilder
Business Acquisition
Total identifiable intangible assets acquired		$ 15,239
MyBuilder \| Developed technology
Business Acquisition
Finite-lived intangible assets acquired		$ 1,499
Weighted-average useful life (years)		2 years
MyBuilder \| User base
Business Acquisition
Finite-lived intangible assets acquired		$ 1,624
Weighted-average useful life (years)		1 year
MyBuilder \| Contractor relationships
Business Acquisition
Finite-lived intangible assets acquired		$ 4,122
Weighted-average useful life (years)		2 years
MyHammer
Business Acquisition
Total identifiable intangible assets acquired				$ 8,107
MyHammer \| Developed technology
Business Acquisition
Finite-lived intangible assets acquired				$ 1,222
Weighted-average useful life (years)				3 years
MyHammer \| User base
Business Acquisition
Finite-lived intangible assets acquired				$ 888
Weighted-average useful life (years)				1 year
MyHammer \| Contractor relationships
Business Acquisition
Finite-lived intangible assets acquired				$ 1,444
Weighted-average useful life (years)				4 years
Indefinite-lived trade name and trademarks \| Angie's List
Business Acquisition
Indefinite-lived trade name and trademarks	$ 137,000
Indefinite-lived trade name and trademarks \| HomeStars
Business Acquisition
Indefinite-lived trade name and trademarks			$ 2,358
Indefinite-lived trade name and trademarks \| MyBuilder
Business Acquisition
Indefinite-lived trade name and trademarks		$ 7,994
Indefinite-lived trade name and trademarks \| MyHammer
Business Acquisition
Indefinite-lived trade name and trademarks				$ 4,553