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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]                      
Defined benefit plan adjustments – actuarial losses                 $ (2,628) $ 2,078  
Income before provision for income taxes                 46,895 25,708 $ 59,906
Tax (expense) benefit                 (11,666) (7,062) (15,286)
Total reclassifications for the period, net of tax $ 7,572 $ 12,415 $ 10,228 $ 5,014 $ 5,718 $ 7,067 $ 2,544 $ 3,317 35,229 18,646 44,620
Reclassification Out of Accumulated Other Comprehensive Income [Member]                      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]                      
Defined benefit plan adjustments – actuarial losses                 (156) (396)  
Income before provision for income taxes                 4,833 9,749 6,780
Tax (expense) benefit                 (1,897) (3,834) (2,644)
Total reclassifications for the period, net of tax                 2,936 5,915 4,136
Reclassification Out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Available-for-Sale Securities [Member]                      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]                      
Net realized investment gain                 5,408 10,348 6,895
Reclassification Out of Accumulated Other Comprehensive Income [Member] | Impairment Expense [Member]                      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]                      
Net realized investment gain                 $ (419) $ (203) $ (115)