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Reclassifications of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net gain on sales of securities $ (14) $ 29,924 $ 3,347
Income tax expense (135,252) (202,014) (281,727)
Net income 422,417 $ 466,201 $ 495,401
Reclassifications, net of tax [1] (5,180)    
Past service liability      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Reclassifications, before tax [1],[2] 249    
Actuarial losses      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Reclassifications, before tax [1],[2] (7,487)    
Amortization of defined benefit pension      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Reclassifications, before tax [1] (7,238)    
Tax benefit [1] 2,068    
Reclassifications, net of tax [1] (5,170)    
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 on sales of securities [1] (14)    
Income tax expense [1] 4    
Net income [1] $ (10)    
[1] Amounts in parentheses indicate expense items.
[2] See Note 12, "Employee Benefits," for additional information.