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Stockholders' Equity - Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items] |  |
Income (loss) before provision for income taxes | $ (14,745) | $ 8,345
Tax (expense) benefit | 3,931 | (1,694)
Total reclassifications for the period, net of tax | (10,814) | 6,651
Reclassification Out of Accumulated Other Comprehensive Income [Member] |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items] |  |
Defined benefit plan adjustments – actuarial losses | (90) | (80)
Income (loss) before provision for income taxes | (163) | 389
Tax (expense) benefit | 36 | (159)
Total reclassifications for the period, net of tax | (127) | 230
Unrealized Gains (Losses) on Available-for-Sale Securities [Member] | Reclassification Out of Accumulated Other Comprehensive Income [Member] |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items] |  |
Net realized investment gain | $ (73) | 572
Impairment Expense [Member] | Reclassification Out of Accumulated Other Comprehensive Income [Member] |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items] |  |
Net realized investment gain |  | $ (103)

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