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Stockholders' Equity - Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
3 Months Ended
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)