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Schedule II. Condensed Financial Information of Registrant - Condensed Balance Sheets (Parenthetical) (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Equity securities, cost | $ 19,962 | $ 8,503
Net of Treasury stock | 22,370 | 22,370
Parent Company [Member] |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Equity securities, cost | 10,007 | 8,503
Net of Treasury stock | $ 22,370 | $ 22,370

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