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Investments - Gross Realized Gains and Losses on Sale of Securities (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Investments Debt And Equity Securities [Abstract] |  |  |  |
Gross realized gains | $ 1,094 | $ 1,346 | $ 3,324 | $ 5,226
Gross realized losses | $ (85) | $ (30) | $ (455) | $ (1,072)

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- Definition This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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