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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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