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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, 2017 | Mar. 31, 2016
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items] |  |
Income before provision for income taxes | $ 8,345 | $ 8,078
Tax (expense) benefit | (1,694) | (3,064)
Total reclassifications for the period, net of tax | 6,651 | 5,014
Reclassification Out of Accumulated Other Comprehensive Income [Member] |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items] |  |
Defined benefit plan adjustments – actuarial losses | (80) | (65)
Income before provision for income taxes | 389 | 1,596
Tax (expense) benefit | (159) | (628)
Total reclassifications for the period, net of tax | 230 | 968
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 | 572 | 1,761
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) | $ (100)

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