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Reclassifications of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net gain on sales of securities $ 29,924 $ 3,347 $ 4,054
Income tax expense (202,014) (281,727) 84,857
Net (Loss) income 466,201 $ 495,401 $ (47,156)
Reclassifications, net of tax [1] (3,060)    
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] (8,484)    
Amortization of defined benefit pension      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Reclassifications, before tax [1] (8,235)    
Tax benefit [1] 3,432    
Reclassifications, net of tax [1] (4,803)    
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] 2,988    
Income tax expense [1] (1,245)    
Net (Loss) income [1] $ 1,743    
[1] Amounts in parentheses indicate expense items.
[2] See Note 12, "Employee Benefits," for additional information.