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Equity Securities (Summary of Investments in Marketable Equity Securities) (Detail) - USD ($) $ in Thousands	Sep. 30, 2021		Dec. 31, 2020
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Equity securities, Cost	$ 459,947		$ 376,320
Equity securities, Estimated fair value	760,758		464,126
Preferred stocks
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Equity securities, Cost	16,810		22,163
Equity securities, Estimated fair value	16,944		19,479
Common stocks
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Equity securities, Cost	443,137	[1]	354,157
Equity securities, Estimated fair value	$ 743,814	[1]	$ 444,647
[1] Includes Offerpad Solutions Inc. with a cost of $85.0 million and estimated fair value of $280.3 million.  See below for further discussion about the Company’s investment in Offerpad Solutions Inc.

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- Definition

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=123594786&loc=SL75136599-209740

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Cost of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value.

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