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Stockholders' Equity - Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]        
Cost of sales $ (79,658) $ (67,844) $ (156,317) $ (131,917)
Income before provision for income taxes 17,869 16,456 26,214 24,534
Tax (expense) benefit (5,468) (6,228) (7,162) (9,292)
Total reclassifications for the period, net of tax 12,401 10,228 19,052 15,242
Reclassification Out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]        
Defined benefit plan adjustments – actuarial losses (124) (33) (204) (98)
Income before provision for income taxes 1,113 1,026 1,502 2,622
Tax (expense) benefit (504) (402) (663) (1,030)
Total reclassifications for the period, net of tax 609 624 839 1,592
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 1,393 1,354 1,965 3,115
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 (2) $ (295) (105) $ (395)
Net Losses on Derivatives Designated as Hedging Instruments [Member] | Reclassification Out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]        
Cost of sales $ (154)   $ (154)