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Investments in debt and equity securities - Additional Information (Detail) - Investments in mutual funds and common stock - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Pre-tax Net Gain (Loss) recognized in Income Statement | $ 1,893 |
Pre-tax Realized Gain (Loss) on Securities Arising During Period | 170 | $ 86
Net Increase (Decrease) in Unrealized Gain on Equity Securities due to changes in Fair Value | $ 1,723 | 3,660
Gain on Sale Of Equity Securities After Tax |  | $ 3,746

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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=84241550&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=84241550&loc=SL75117546-209714 + Details
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