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Investments - Summary of Details on Realized and Unrealized Gains and Losses Related to Equity Securities (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Net Investment Income [Line Items] |  |
Unrealized gains and (losses) recognized during the reported period on equity securities still held at the end of the reported period | $ (8,024) | $ 18,032
Equity Securities [Member] |  |
Net Investment Income [Line Items] |  |
Unrealized gains and (losses) recognized during the reported period on equity securities still held at the end of the reported period | $ (8,024) | $ 2,400

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- Definition Amount of unrealized gain (loss) on 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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=116654751&loc=SL75117546-209714 + Details
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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. + Details
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- Details
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