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Reclassifications of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net gain (loss) on securities     $ 7,755  
Income tax (expense) benefit $ (33,172) $ (30,022) (97,305) $ (104,398)
Net income $ 99,046 $ 106,772 293,869 $ 320,678
Reclassifications, net of tax [1]     (1,462)  
Past service liability        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Reclassifications, before tax [1],[2]     187  
Actuarial losses        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Reclassifications, before tax [1],[2]     (7,619)  
Amortization of defined benefit pension        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Reclassifications, before tax [1]     (7,432)  
Tax benefit [1]     2,052  
Reclassifications, net of tax [1]     (5,380)  
Reclassification out of Accumulated Other Comprehensive Income (loss) | Unrealized gains on available-for-sale securities        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net gain (loss) on securities [1]     5,445  
Income tax (expense) benefit [1]     (1,527)  
Net income [1]     $ 3,918  
[1] Amounts in parentheses indicate expense items.
[2] See Note 8, “Pension and Other Post-Retirement Benefits,” for additional information.