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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]                      
Cost of sales                 $ (279,541) $ (270,695) $ (293,843)
Defined benefit plan adjustments – actuarial losses                 (1,294) 2,628  
Income before provision for income taxes                 44,687 46,895 25,708
Tax (expense) benefit                 (20,847) (11,666) (7,062)
Total reclassifications for the period, net of tax $ (11,110) $ 15,898 $ 12,401 $ 6,651 $ 7,572 $ 12,415 $ 10,228 $ 5,014 23,840 35,229 18,646
Reclassification Out of Accumulated Other Comprehensive Income [Member]                      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]                      
Defined benefit plan adjustments – actuarial losses                 (406) (156) (396)
Income before provision for income taxes                 3,381 4,833 9,749
Tax (expense) benefit                 (1,423) (1,897) (3,834)
Total reclassifications for the period, net of tax                 1,958 2,936 5,915
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                 4,864 5,408 10,348
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                 (180) $ (419) $ (203)
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)