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Capitalized Contract Cost, Noncurrent

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Short-term investments must have a maturity, at the date of purchase, of less than this specified period in order to be classified as cash equivalents.

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Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount

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Impairment Assessment of Indefinite Lived Intangible Assets Fair Value Inputs Royalty Rate

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Market Capitalization

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Percentage of Market Capitalization

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

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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.

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Amount of deferred tax liability attributable to taxable temporary differences from capitalized costs.

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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

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Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill.

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Amount after tax of income (loss) from continuing operations including portion attributable to the noncontrolling interest.

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Change in noncontrolling interest during the period as a result of a change in the redemption value of redeemable noncontrolling interest.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - NARRATIVE (Details) - USD ($)			12 Months Ended
	Oct. 01, 2017	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Deferred revenue
Deferred revenue			$ 64,100,000	$ 18,800,000
Cash equivalents maturity period at purchase (less than)			91 days
Market capitalization	$ 5,900,000,000
Percentage of market capitalization	450.00%
Discount rate of fair value inputs (as a percent)				17.00%
Goodwill and indefinite-lived intangible assets impairment			$ 0	$ 0	$ 0
Advertising expense			282,300,000	196,800,000	145,400,000
Adjustment of redeemable noncontrolling interests to fair value			(3,332,000)	3,110,000	(12,170,000)
Retained earnings (accumulated deficit)			(121,764,000)	0
Net (loss) earnings			(104,527,000)	10,631,000	(3,996,000)
Excess tax benefit of share-based compensation			32,702,000	0	0
Angie's List
Deferred revenue
Deferred revenue			37,700,000
Redeemable Noncontrolling Interest
Deferred revenue
Adjustment of redeemable noncontrolling interests to fair value			3,332,000	(3,110,000)	12,170,000
Restatement Adjustment \| Accounting Standards Update 2016-09
Deferred revenue
Excess tax benefit of share-based compensation			$ 35,800,000	$ 7,700,000	$ 100,000
Europe
Deferred revenue
Percentage of market capitalization		60.00%
North America
Deferred revenue
Percentage of market capitalization	500.00%
Minimum
Deferred revenue
Discount rate of fair value inputs (as a percent)			11.50%
Maximum
Deferred revenue
Discount rate of fair value inputs (as a percent)			18.50%
Indefinite-lived Intangible Assets
Deferred revenue
Royalty rate of impairment assessment of indefinite lived intangibles (as a percent)				1.00%
Indefinite-lived Intangible Assets \| Minimum
Deferred revenue
Royalty rate of impairment assessment of indefinite lived intangibles (as a percent)			1.00%
Indefinite-lived Intangible Assets \| Maximum
Deferred revenue
Royalty rate of impairment assessment of indefinite lived intangibles (as a percent)			6.00%
Difference between Revenue Guidance in Effect before and after Topic 606 \| Accounting Standards Update 2014-09
Deferred revenue
Current capitalized contract cost			$ 30,000,000
Non-current capitalized contract cost			5,000,000
Deferred tax liability			10,000,000
Retained earnings (accumulated deficit)			25,000,000
Net (loss) earnings			$ 8,000,000