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Income Taxes - Narrative (Detail) - USD ($)	3 Months Ended			6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Schedule Of Income Tax [Line Items]
Income tax expense (benefit)	$ (13,310,000)	$ (679,000)		$ (10,420,000)	$ 8,549,000
Non-cash impairment charge				$ 0	76,800,000
Trulia
Schedule Of Income Tax [Line Items]
Income tax expense (benefit)					8,500,000
Trulia | Trade names and trademarks
Schedule Of Income Tax [Line Items]
Income tax expense (benefit)					9,700,000
Non-cash impairment charge			$ 71,500,000		$ 71,500,000
Federal
Schedule Of Income Tax [Line Items]
Net operating loss carryforwards						$ 1,700,000,000
State
Schedule Of Income Tax [Line Items]
Net operating loss carryforwards						$ 53,200,000

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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