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Intangible Assets, net - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Amortization of website development costs and intangible assets included in technology and development | $ 13,400,000 | $ 13,100,000 |  | $ 26,300,000 | $ 24,900,000
Non-cash impairment charge |  |  |  | 0 | 76,800,000
Indefinite-lived intangible asset | 108,000,000.0 |  |  | 108,000,000.0 |
Fair value of the intangible asset | $ 36,500,000 |  |  | $ 36,500,000 |
Trade names and trademarks | Trulia |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Non-cash impairment charge |  |  | $ 71,500,000 |  | $ 71,500,000
Useful life |  |  |  | 10 years |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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