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Investments - Summary of Proceeds Received and The Gross Realized Gains and Losses From Sales of Equity Securities (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Debt and Equity Securities, FV-NI [Line Items]
Proceeds			$ 17,385	$ 34,345
Equity Securities [Member]
Debt and Equity Securities, FV-NI [Line Items]
Proceeds	$ 4,930	$ 1,504	17,385	34,345
Gross Realized Gains	244	43	1,213	2,230
Gross Realized Losses	$ (63)	$ (99)	$ (2,995)	$ (2,875)

X

- Definition

The cash inflow associated with the sale of equity securities measured at fair value with change in fair value recognized in net income.

+ References

No definition available.

+ Details

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X

- Definition

Amount of realized gain from sale 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 321
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=120269885&loc=SL75117546-209714

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- Definition

Amount of realized loss from sale 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 321
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=120269885&loc=SL75117546-209714

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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