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Investments in debt and equity securities - Additional Information (Detail) - Investments in mutual funds and common stock - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Pre-tax Net Gain (Loss) recognized in Income Statement | $ (120) | $ 2,634
Pre-tax Realized Gain (Loss) on Securities Arising During Period | 698 | 308
Net Increase Decrease In Unrealized Gains On Equity Securities | $ (818) | $ 2,326

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- Definition Amount of unrealized and realized 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=120269885&loc=SL75117546-209714 + Details
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- 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 + Details
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