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Stockholders' Equity - Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Income (Loss) Before Income Taxes | $ (14,337) | $ 1,078
Tax benefit | 4,368 | (308)
Net Income (Loss) | (9,969) | 770
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member] |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Defined benefit plan adjustments – actuarial losses | (204) | (175)
Income (Loss) Before Income Taxes | (1,620) | (113)
Tax benefit | 431 | 38
Net Income (Loss) | (1,189) | (75)
Unrealized Gains (Losses) on Available-for-Sale Securities [Member] | Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member] |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Net investment gain | $ (1,416) | $ 62

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