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Investments - Summary of Available-for-Sale Debt Securities and Equity Securities (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Available-for-Sale Debt Securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Proceeds from sales and maturities (fair value) | $ 68,875 | $ 30,822 | $ 193,702 | $ 50,651
Gross realized gains on sale of securities | 10 | 28 | 317 | 28
Gross realized losses on sale of securities | (42) | (4) | (3,114) | (40)
Equity Securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Proceeds from sales and maturities (fair value) | 3,082 | 54,471 | 4,127 | 56,971
Gross realized gains on sale of securities | $ 177 | 1,785 | $ 301 | 1,785
Gross realized losses on sale of securities |  | $ (99) |  | $ (126)

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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 cash inflow from sale, maturity, prepayment and call of 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 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3151-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26853-111562 + Details
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