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Schedule of Investments in Equity Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Equity securities, at fair value	$ 75,941	$ 263,104
Common Stock
Debt Securities, Available-for-sale [Line Items]
Equity securities, at fair value	0	135,329
Preferred Stock
Debt Securities, Available-for-sale [Line Items]
Equity securities, at fair value	11,268	11,656
Index Funds that Invest in Common Stock
Debt Securities, Available-for-sale [Line Items]
Equity securities, at fair value	0	61,471
Index Funds that Invest in Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Equity securities, at fair value	$ 64,673	$ 54,648

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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).

+ 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=99377092&loc=SL75136599-209740

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