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Nature of Business and Summary of Significant Accounting Policies (Other Comprehensive Income) - Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]
Defined benefit plan adjustments – actuarial losses									$ 2,139	$ (1,294)
Income (Loss) before (Provision) Benefit for Income Taxes									(33,371)	44,687	$ 46,895
Tax expense									14,029	(20,847)	(11,666)
Total reclassifications for the period, net of tax	$ (8,447)	$ 7,589	$ (7,670)	$ (10,814)	$ (11,110)	$ 15,898	$ 12,401	$ 6,651	(19,342)	23,840	35,229
Cost of sales									(325,712)	(363,265)	(345,451)
Reclassification Out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]
Defined benefit plan adjustments – actuarial losses									(196)	(406)	(156)
Income (Loss) before (Provision) Benefit for Income Taxes									608	3,381	4,833
Tax expense									(148)	(1,423)	(1,897)
Total reclassifications for the period, net of tax									460	1,958	2,936
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 investment gain (loss)									$ 804	4,864	5,408
Impairment Expense [Member] | Reclassification Out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]
Net investment gain (loss)										(180)	$ (419)
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										$ (897)

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