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Investments in debt and equity securities - Additional Information (Detail) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Jan. 01, 2018
Investments in mutual funds and common stock |  |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |  |
Pre-tax Net Gain (Loss) recognized in Income Statement | $ 1,597 |  |
Pre-tax Realized Gain (Loss) on Securities Arising During Period | 4,101 | $ (362) |
Net Decrease in Unrealized Gain on Equity Securities due to changes in Fair Value | $ 2,504 |  |
Gain on Sale Of Equity Securities After Tax |  | $ (221) |
Investment securities |  |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  | $ (5,662)

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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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- Definition Amount of unrealized gain 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/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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