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Investments - Summary of Available-for-Sale Debt Securities and Equity Securities (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Proceeds from sales and maturities (fair value) |  |  | $ 8,285 | $ 75,027
Available-for-Sale Debt Securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Proceeds from sales and maturities (fair value) | $ 32,287 | $ 49,762 | 225,989 | 100,413
Gross realized gains on sale of securities | 1 | 302 | 318 | 330
Gross realized losses on sale of securities | (11) | (19) | (3,125) | (59)
Equity Securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Proceeds from sales and maturities (fair value) | 4,158 | 18,056 | 8,285 | 75,027
Gross realized gains on sale of securities | $ 413 | 547 | $ 714 | 2,332
Gross realized losses on sale of securities |  | $ (27) |  | $ (153)

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- Definition Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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- Definition Amount of realized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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