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Investments of Insurance Subsidiaries - Additional Information (Detail) | 9 Months Ended
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Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract] |
Available for sale securities expected maturity of debt securities | 5 years 6 months
Available for sale securities average scheduled maturity | 9 years 9 months 18 days

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- Definition Available for sale securities expected maturity of debt securities (in years). + References No definition available. + Details
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